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小数加减法专项练习200题(有答案).doc

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1、. .小数加减法专项练习 200题(有答案) (1)7.4+12.86(2)205.674(3)141.248.98(4)102+4.36(5)32.1527.45(6)12.9+5.01(7)29.46(9.46+3.8)(8)15.75+0.652.75+3.35(9)65.714.99(10)12.42+0.48(11)0.56+11.534(12)4422.13(13)9122.035(14)52.6+21.237(15)9.152.18(16)3.851.5+1.32.(17)15.4+6.87(18)3.56+27.84. .(19)10082.13=17.87(20)123.56

2、47.9+51.7(21)2.7+3.1+2.9+3.2.(22)28.42+19.48(23)42.56+3.124(24)8130.75(25)15.6 十 0.237(26)148.225.6224.38(27)4.520.740.26(28)0.42+5.4+1.58+2.6(29)5.9+28.6516.57 (30)57.53.2516.75.(31)6.02+3.6+1.98(32)1.29+3.7+2.71+6.3(33)3.070.381.62(34)3.25+1.790.59+1.75(35)7.5+4.96.1(36)14.8+7.94.8(37)2.608+2.84(3

3、8)6.073.869. .(39)1.50.306(40)76.8+26.82(41)102.0737.257(42)48.64+18.6(43)54.755.2514.75. (44)4.68+14.79+5.3210.79. (45)48.912.70.3.(46)56.439.7+24.3.(47)3.62.8+3.47.2.(48)3.67+18.5+6.33.(49)12017.832.17.(50)17.176.83.26.17(51)73.81.6413.85.36(52)6.75(0.9+3.75)(53)27.385.34+2.624.66 (54)35.724.9(5.7

4、2+5.1)(55)0.730.250.73+0.25 (56)5.3+0.1+5.30.1 (57)12.74.85.2(58)23.256.753.25. .(59)4.58+2.39+(5.42+7.61)(60)9.053.863.14(61)209.180.82(62)6.53(1.53+2.6)(63)5.521.0740.926(64)4.21+1.04+0.79(65)1.36+4.85+2.64+6.15(66)83.712.830.17(67)4.32+5.43+6.68(68)17.176.83.2.(69)1+12.7+5.9+17.3(70)27042.517.5(7

5、1)15.68(7.784.32)2.32.(72)0.9+9.9+99.9+999.9.(73)25.468.231.76.(74)9.4+0.36.4.(75)15.25+4.72+4.75+5.28.(76)34.823(4.82+15.2).(77)12.74.85.2.(78)3.1+25.78+6.9. .(79)73.81.6413.85.36.(80)2.15+8.73+1.27+7.85(81)11.87(8.2+1.87).(82)5.423.871.13.(83)4.381.56+0.620.44.(84)46.715.034.97(85)4.52+0.61+1.39+6

6、.48(86)4.27(1.961.73)(87)7.27(1.98+0.27).(88)13.7+8.659.628.(89)12.8(4.38+1.614)(90)15.17(3.6+4.9).(91)35.6+(12.64.4).(92)16.4+3.5+83.6+166.5 (93)4.652.551.45.(94)1.28+0.86+38.72.(95)25.743.576.43.(96)14.54.685.32.(97)0.485+0.64+3.36.(98)72.519.3412.66. .(99)14.024.5+0.98.(100)5.76+2.43+0.24+10.57.(

7、101)9.28(3.28+2.55).(102)9.5+4.856.13.(103)10.751.862.753.16.(104)1.3+0.94+0.06+7.7.(105)4.45+0.63+5.55.(106)45.5(0.98+5.5).(107)0.960.28+0.040.72.(108)12.7+12.5+0.5.(109)0.6+0.940.208.(110)27.73(4.731.85).(111)3.84+26.5(208.6).(112)7.385.14+3.622.86.(113)5.86+13.089.27.(114)25.4(15.46.4).(115)47.23

8、7.235.89.(116)4.45+0.63+5.55.(117)5.28(2.9+1.28).(118)5.25+7.862.86+4.75. .(119)0.960.28+0.040.72.(120)9.42+7.39+1.58.(121)18.41.65.4.(122)75.7+39.423.86.(123)21.21+38.389.79.(124)47.28+1.39+52.72.(125)2.451.68+1.54.(126)158.131.87.(127)5.14+3.2256.302.(128)3.95+5.361.95.(129)13.67(5.45+3.67).(130)4

9、.26+5.481.26+4.52.(131)14.67+25.91+15.33+4.09.(132)10.75(2.40.86).(133)9.614.38+0.35.(134)3.87+4.92+1.13.(135)46.248.661.34.(136)21.99.220.78+8.1.(137)35.47+39.8812.37.(138)93.215.9914.01. .(139)15.37+28.94+4.63+1.06.(140)42.37(12.379.78).(141)38.7819.59+41.2230.41.(142)1.9+19.9+199.9+0.3(143)429+31

10、.1+2.04.(144)10027.242.8.(145)9(3.02+1.25).(146)1.81.57+0.2.(147)5.032.5+0.96.(148)35.72(5.9+5.72).(149)254.7+5.3.(150)1.3+2.83+8.7+0.17.(151)2.472.23.8+7.53.(152)6.89+4.7+2.11+5.3.(153)7.462.371.63.(154)14(3.65+0.24).(155)70.81.251.75.(156)5.81+8.3+4.19+11.7.(157)4.2+7.64+5.8+2.36.(158)14.282.637.3

11、7. .(159)6.8+5.26+3.74+3.2.(160)6.213.8+2.2.(161)6.03+3.7+2.97.(162)17.436.572.43.(163)20.47(1.47+6.8).(164)13.26+4.71+3.47+5.29.(165)22.74+8.6813.74.(166)12.566.643.36.(167)45.5(0.98+5.5).(168)13.6+7.94+6.4.(169)15.19+3.36+4.64+4.81.(170)4.7+7.69+5.3+2.31.(171)53.7813.637.4+6.22.(172)60(21.58.8)+7.

12、3.(173)9.5+4.856.13.(174)75.8(15.34.8). (175)51.278.661.34.(176)28.43.961.04+4.6.(177)70.87.251.75(178)5.81+8.3+4.19+11.7. .(179)794198.(180)6756193207.(181)0.9+1.08+0.92+0.1.(182)13.596.910.09. (183)4.58+3.38+(5.48+6.62)(184)73.75(4.3+8.75)(185)5(4.192.83).(186)1.39+0.72+0.61+3.28.(187)83.76.3.(188

13、)8.28(1.28+3.7).(189)15.377.59+5.7312.41.(190)11.727.85(1.26+0.46).(191)15.37+28.44+12.56.(192)12.64(3.96+4.64).(193)36.264.78+3.74.(194)7.34+7.57+12.66+6.43.(195)78.6523.1214.88.(195)4.58+2.39+(5.42+7.61).(196)8.27+5.84+1.73+2.16.(197)18.519.080.92. .(198)0.09+0.6+5.91+3.4.(199)7.85+6.76+2.15(200)1

14、8.433.767.24(201)21.65+(4.83.65)(202)9.64(4.641.23)(203)2.7+17.6+3.35.6(204)9.873.5+2.138.5(205)5.64+4.97+0.03.(206)10.933.744.26.(207)106.83.2.(208)5.81+8.3+4.19+11.7.(209)3.781.46+1.54.(210)8.45(5.45+2.98) ;.(211)3.01+8.2+6.99+1.8.(212)4.3(5.985.7).(213)5.520.550.45.(214)19.626.72+80.43.28.(215)27

15、.510.80.2.(216)43.5+1813.5.(217)63.5(43.5+20). .(218)75.3624.9+24.6425.1.(219)12.566.643.36.(220)45.5(0.98+5.5).(221)6+7.94+6.4.(222)5.41+3.462.46.(223)2.030.182.82+7.97.(224)104.445.56.(225)32.63+7.896.4.(226)3.97+0.71.32.(227)30(3.8+0.75).(228)75.6(14.38.3). .参考答案:(1)7.4+12.86=20.26;(2)205.674=14.

16、326;(3)141.248.98=92.22;(4)102+4.36=106.36;(5)32.1527.45=4.7;验算:(6)12.9+5.01=17.91;验算:(7)29.46(9.46+3.8).=29.469.463.8.=203.8.=16.2;(8)15.75+0.652.75+3.35.=(15.752.75)+(0.65+3.35).=13+4.=17;(9)65.714.99.=65.71(50.01).=65.715+0.01.=60.71+0.01.=60.72;(10)12.42+0.48=12.9.(11)0.56+11.534=12.094.(12)4422

17、.13=21.87.(13)9122.035=68.965.(14)52.6+21.237=73.837.(15)9.152.18=6.97(16)3.851.5+1.32.=2.35+1.32.=3.67;(17)15.4+6.87=22.27验算:(18)3.56+27.84=31.4验算:(19)10082.13=17.87验算:(20)123.5647.9+51.7=127.36. .验算:(21)2.7+3.1+2.9+3.2.=2.7+(3.1+2.9)+3.2.=2.7+6+3.2.=11.9(22)28.42+19.48=47.9验算:(23)42.56+3.124=45.68

18、4验算:(24)8130.75=50.25验算:(25)15.6 十 0.237=15.837验算:(26)148.225.6224.38=148.2(25.62+24.38).=148.250.=98.2(27)4.520.740.26=4.52(0.74+0.26)=4.521=3.52;(28)0.42+5.4+1.58+2.6=(0.42+1.58)+(5.4+2.6)=2+8=10;(29)5.9+28.6516.57=17.98;(30)57.53.2516.75.=57.5(3.25+16.75).=57.520.=37.5;(31)6.02+3.6+1.98=6.02+1.98

19、+3.6.=8+3.6.=11.6;(32)1.29+3.7+2.71+6.3=(1.29+2.71)+(3.7+6.3).=4+10.=14;(33)3.070.381.62=3.07(0.38+1.62).=3.072.=1.07;(34)3.25+1.790.59+1.75=(3.25+1.75)+(1.790.59).=5+1.2.=6.2;(35)7.5+4.96.1=12.46.1.=6.3;(36)14.8+7.94.8=14.84.8+7.9.=10+7.9=17.9(37)2.608+2.84=5.448. .(38)6.073.869=2.201.(39)1.50.306=

20、1.194.(40)76.8+26.82=103.62.(41)102.0737.257=64.813.(42)48.64+18.6=67.24(43)54.755.2514.75.=54.75(14.75+5.25).=54.7520.=34.75; (44)4.68+14.79+5.3210.79.=(4.68+5.32)+(14.7910.79).=10+4.=14; (45)48.912.70.3.=48.9(12.7+0.3).=48.913.=35.9;(46)56.439.7+24.3.=16.7+24.3.=41;(47)3.62.8+3.47.2.=(3.6+13.4)(2.

21、8+7.2).=1710.=7;(48)3.67+18.5+6.33.=(3.67+6.33)+18.5.=10+18.5.=28.5;(49)12017.832.17.=12017.832.17.=120(17.83+2.17).=12020.=100;(50)17.176.83.26.17=(17.176.17)(6.8+3.2).=1110.=1;(51)73.81.6413.85.36=73.813.8(1.64+5.36).=607.=53;(52)6.75(0.9+3.75)=6.753.750.9.=30.9.=2.1;(53)27.385.34+2.624.66 =22.04+

22、2.624.66.=24.664.66.=20;(54)35.724.9(5.72+5.1)=35.72(4.9+5.72+5.1).=35.7215.72.=20;(55)0.730.250.73+0.25 =0.750.750.25+0.25.=00.25+0.25.=00.=0;(56)5.3+0.1+5.30.1 =5.3+5.3+0.10.1.=10.6+0.10.1.=10.70.1.=10.6;(57)12.74.85.2=12.7(4.8+5.2) ;=12.710.=2.7(58)23.256.753.25=23.25(6.75+3.25).=23.2510.=13.25(5

23、9)4.58+2.39+(5.42+7.61)=(4.58+5.42)+(2.39+7.61)=10+10.=20;(60)9.053.863.14.=9.05(3.86+3.14).=9.057.=2.05;(61)209.180.82.=20(9.18+0.82).=2010.=10. .(62)6.53(1.53+2.6).=6.531.532.6.=42.6.=1.4(63)5.521.0740.926.=5.52(1.074+0.926).=5.522.=3.52(64)4.21+1.04+0.79.=4.21+0.79+1.04.=5+1.04.=6.04(65)1.36+4.85

24、+2.64+6.15.=(1.36+2.64)+(4.85+6.15).=4+11.=15;(66)83.712.830.17.=83.7(12.83+0.17).=83.713.=70.7;(67)4.32+5.43+6.68.=4.32+6.68+5.43.=11+5.43.=16.43;(68)17.176.83.2.=17.17(6.8+3.2).=17.1710.=7.17;(69)1+12.7+5.9+17.3=1+(12.7+17.3)+5.9.=1+30+5.9.=36.9;(70)27042.517.5=270(42.5+17.5).=27060.=210;(71)15.68

25、(7.784.32)2.32.=15.687.78+4.322.32.=(15.68+4.32)(7.78+2.32).=2010.=10;(72)0.9+9.9+99.9+999.9.=10.1+100.1+1000.1+10000.1.=(1+10+100+1000)(0.1+0.1+0.1+0.1).=11110.4.=1110.6(73)25.468.231.76.=25.46(8.23+1.76).=25.469.99=15.45;(74)9.4+0.36.4.=(9.46.4)+0.3.=3+0.3.=3.3;(75)15.25+4.72+4.75+5.28.=(15.25+4.7

26、5)+(4.72+5.28).=20+10.=30;(76)34.823(4.82+15.2).=34.8234.8215.2.=30.00315.2.=14.803;(77)12.74.85.2.=12.7(4.8+5.2).=12.710.=2.7;(78)3.1+25.78+6.9.=(3.1+6.9)+25.78.=10+25.78.=35.78;(79)73.81.6413.85.36.=(73.813.8)(1.64+5.36).=607.=53(80)2.15+8.73+1.27+7.85=(2.15+7.85)+(8.73+1.27).=10+10.=20;(81)11.87(

27、8.2+1.87).=11.871.878.2.=108.2.=1.8;(82)5.423.871.13.=5.425.=0.42;(83)4.381.56+0.620.44.=(4.38+0.62)(1.56+0.44).=52.=3;(84)46.715.034.97=46.7(15.03+4.97).=46.720.=26.7;(85)4.52+0.61+1.39+6.48=(4.52+6.48)+(0.61+1.39).=11+2.=13;(86)4.27(1.961.73). .=4.270.23.=4.04;(87)7.27(1.98+0.27).=7.270.271.98.=71

28、.98.=5.02;(88)13.7+8.659.628.=22.359.628.=12.722;(89)12.8(4.38+1.614)=12.85.994=6.806(90)15.17(3.6+4.9).=15.178.5.=6.67;(91)35.6+(12.64.4).=35.6+8.2.=43.8;(92)16.4+3.5+83.6+166.5=(16.4+83.6)+(3.5+166.5)=100+170=270; (93)4.652.551.45.=4.65(2.55+1.45).=4.654.=0.65;(94)1.28+0.86+38.72.=(1.28+38.72)+0.8

29、6.=40+0.86.=40.86;(95)25.743.576.43.=25.74(3.57+6.43).=25.7410.=15.74;(96)14.54.685.32.=14.5(4.68+5.32).=14.510.=4.5;(97)0.485+0.64+3.36.=0.485+(0.64+3.36).=0.485+4.=4.485;(98)72.519.3412.66.=72.51(9.34+12.66).=72.5122.=50.51;(99)14.024.5+0.98.=(14.02+0.98)4.5.=154.5.=10.5;(100)5.76+2.43+0.24+10.57.

30、=(5.76+0.24)+(2.43+10.57).=6+13.=19;(101)9.28(3.28+2.55).=9.283.282.55.=62.55.=3.45;(102)9.5+4.856.13.=14.356.13.=8.22;(103)10.751.862.753.16.=(10.752.75)(1.86+3.16).=85.02.=2.98(104)1.3+0.94+0.06+7.7.=(1.3+7.7)+(0.94+0.06).=9+1.=10;(105)4.45+0.63+5.55.=(4.45+5.55)+0.63.=10+0.63.=10.63;(106)45.5(0.9

31、8+5.5).=45.50.985.5.=(45.55.5)0.98.=400.98.=40(10.02).=401+0.2.=39.02;(107)0.960.28+0.040.72.=(0.96+0.04)(0.28+0.72).=11.=0(108)12.7+12.5+0.5.=12.7+(12.5+0.5).=12.7+13.=25.7(109)0.6+0.940.208.=1.540.208.=1.332;(110)27.73(4.731.85).=27.734.73+1.85.=23+1.85.=24.85;(111)3.84+26.5(208.6).=3.84+26.511.4.

32、=3.84+15.1. .=18.94 (112)7.385.14+3.622.86.=(7.38+3.62)(5.14+2.86).=118.=3;(113)5.86+13.089.27.=18.949.27.=9.67;(114)25.4(15.46.4).=25.415.4+6.4.=10+6.4.=16.4;(115)47.237.235.89.=405.89.=34.11(116)4.45+0.63+5.55.=4.45+5.55+0.63.=10+0.63.=10.63;(117)5.28(2.9+1.28).=5.281.282.9.=42.9.=1.1;(118)5.25+7.

33、862.86+4.75.=(5.25+4.75)+(7.862.86).=10+5.=15;(119)0.960.28+0.040.72.=(0.96+0.04)(0.28+0.72).=11.=0(120)9.42+7.39+1.58.=(9.42+1.58)+7.39.=11+7.39.=18.39;(121)18.41.65.4.=18.4(1.6+5.4).=18.47.=11.4(122)75.7+39.423.86.=115.123.86.=91.24;(123)21.21+38.389.79.=59.599.79.=49.8;(124)47.28+1.39+52.72.=47.2

34、8+52.72+1.39.=100+1.39.=101.39;(125)2.451.68+1.54.=0.77+1.54.=2.31(126)158.131.87.=15(8.13+1.87).=1510.=5;(127)5.14+3.2256.302.=8.3656.302.=2.063;(128)3.95+5.361.95.=3.951.95+5.36.=2+5.36.=7.36;(129)13.67(5.45+3.67).=13.675.453.67.=13.673.675.45.=105.45.=4.55;(130)4.26+5.481.26+4.52.=(4.52+5.48)+(4.

35、261.26).=10+3;=13;(131)14.67+25.91+15.33+4.09.=(14.67+15.33)+(25.91+4.09).=30+30.=60(132)10.75(2.40.86).=10.751.54.=9.21;(133)9.614.38+0.35.=5.23+0.35.=5.58;(134)3.87+4.92+1.13.=(3.87+1.13)+4.92.=5+4.92.=9.92;(135)46.248.661.34.=46.24(8.66+1.34).=46.2410.=36.24;(136)21.99.220.78+8.1.=21.9(9.22+0.78)

36、+8.1.=21.910+8.1.=11.9+8.1.=20;(137)35.47+39.8812.37.=(35.4712.37)+39.88.=23.1+39.88. .=62.98;(138)93.215.9914.01.=93.21(5.99+14.01).=93.2120.=73.21;(139)15.37+28.94+4.63+1.06.=(15.37+4.63)+(28.94+1.06).=20+30.=50;(140)42.37(12.379.78).=42.3712.37+9.78.=30+9.78.=39.78(141)38.7819.59+41.2230.41.=38.7

37、8+41.2219.5930.41.=(38.78+41.22)(19.59+30.41).=8050.=30;(142)1.9+19.9+199.9+0.3=1.9+19.9+199.9+0.1+0.1+0.1.=(1.9+0.1)+(19.9+0.1)+(199.9+0.1).=2+20+200.=222;(143)429+31.1+2.04.=429+(31.1+2.04).=429+33.14.=462.14.(144)10027.242.8.=100(27.2+42.8).=10070.=30.(145)9(3.02+1.25).=94.27.=4.73.(146)1.81.57+0

38、.2.=1.8+0.21.57.=21.57.=0.43(147)5.032.5+0.96.=2.53+0.96.=3.49;(148)35.72(5.9+5.72).=35.725.95.72.=35.725.725.9.=305.9.=24.1;(149)254.7+5.3.=20.3+5.3.=25.6;(150)1.3+2.83+8.7+0.17.=(1.3+8.7)+(2.83+0.17).=10+3.=13;(151)2.472.23.8+7.53.=(2.47+7.53)(2.2+2.8).=105.=5(152)6.89+4.7+2.11+5.3.=(6.89+2.11)+(4

39、.7+5.3).=9+10.=19;(153)7.462.371.63.=7.46(2.37+1.63).=7.464.=3.46;(154)14(3.65+0.24).=143.89.=10.11;(155)70.81.251.75.=70.8(1.25+1.75).=70.83.=67.8;(156)5.81+8.3+4.19+11.7.=(5.81+4.19)+(8.3+11.7).=10+20.=30;(157)4.2+7.64+5.8+2.36.=(4.2+5.8)+(7.64+2.36).=10+10.=20;(158)14.282.637.37.=14.28(2.63+7.37)

40、.=14.2810.=4.28;(159)6.8+5.26+3.74+3.2.=(6.8+3.2)+(5.26+3.74).=10+9.=19;(160)6.213.8+2.2.=2.41+2.2.=4.61;(161)6.03+3.7+2.97.=(6.03+2.97)+3.7.=9+3.7.=12.7;(162)17.436.572.43.=17.43(6.57+2.43). .=17.439.=8.43;(163)20.47(1.47+6.8).=20.471.476.8.=196.8.=12.2;(164)13.26+4.71+3.47+5.29.=(13.26+3.47)+(4.71

41、+5.29).=16.73+10.=26.73;(165)22.74+8.6813.74.=(22.7413.74)+8.68.=9+8.68.=17.68(166)12.566.643.36.=12.56(6.64+3.36).=12.5610.=2.56;(167)45.5(0.98+5.5).=45.50.985.5.=45.55.50.98.=400.98.=39.02;(168)13.6+7.94+6.4.=(13.6+6.4)+7.94.=20+7.94.=27.94;(169)15.19+3.36+4.64+4.81.=(15.19+4.81)+(3.36+4.64).=20+8

42、.=28(170)4.7+7.69+5.3+2.31.=(4.7+5.3)+(7.69+2.31).=10+10.=20(171)53.7813.637.4+6.22.=(53.78+6.22)(13.6+37.4).=6051.=9(172)60(21.58.8)+7.3.=6012.7+7.3.=47.3+7.3.=54.6(173)9.5+4.856.13.=14.356.13.=8.22;(174)75.8(15.34.8).=75.810.5.=65.3; (175)51.278.661.34.=51.27(8.66+1.34).=51.2710.=41.27;(176)28.43.

43、961.04+4.6.=(28.4+4.6)(3.96+1.04).=335.=28;(177)70.87.251.75=70.8(7.25+1.75).=70.89.=61.8;(178)5.81+8.3+4.19+11.7=(5.81+4.19)+(8.3+1.7).=10+10.=20;(179)794198.=794(2002).=794200+2.=594+2.=596;(180)6756193207.=6756(193+207).=6756400.=6356;(181)0.9+1.08+0.92+0.1.=(0.9+0.1)+(1.08+0.92).=1+2.=3;(182)13.

44、596.910.09.=13.59(6.91+0.09).=13.597.=6.59 (183)4.58+3.38+(5.48+6.62)=4.58+5.48+(3.38+6.62).=10.06+10.=20.06;(184)73.75(4.3+8.75)=73.758.754.3.=654.3.=60.7;(185)5(4.192.83).=51.36.=3.64;(186)1.39+0.72+0.61+3.28.=(1.39+0.61)+(0.72+3.28).=2+4.=6;(187)83.76.3. .=8(3.7+6.3).=810.=2;(188)8.28(1.28+3.7).=

45、8.281.283.7.=73.7.=3.3 (189)15.377.59+5.7312.41.=(15.37+5.73)(7.59+12.41).=2120.=1;(190)11.727.85(1.26+0.46).=11.727.851.72.=11.721.727.85.=107.85.=2.15(191)15.37+28.44+12.56.=15.37+(28.44+12.56).=15.37+41.=56.37; (192)12.64(3.96+4.64).=12.643.964.64.=12.644.643.96.=83.96.=4.04;(193)36.264.78+3.74.=

46、36.26+3.744.78.=404.78.=35.22;(194)7.34+7.57+12.66+6.43.=(7.34+12.66)+(7.57+6.43).=20+14.=34;(195)78.6523.1214.88.=78.65(23.12+14.88).=78.6538.=40.65(195)4.58+2.39+(5.42+7.61).=(4.58+5.42)+(2.39+7.61).=10+10.=20(196)8.27+5.84+1.73+2.16.=(8.27+1.73)+(5.84+2.16).=10+8.=18(197)18.519.080.92.=18.51(9.08+0.92).=18.5110.=8.51(198)0.09+0.6+5.91+3.4.=(0.09+5.91)+(0.6+3.4).=6+4.=10(199)7.85+6.76+2.15=7.85+2

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