1、1(1) +2.4=653(2)3.5: =5:4.2(3)1.8=2.4(4) =x108.52(5)63 1.8=7.2(6)175=2.4+3 51(7) = 4x2.1(8) = 83(9)12.6 2=865(10) =.1x.0(11) =53251(12) +50%=42(13)413=31(14)4.5+8=27 21(15)2+4.33=14(16) (1 )183(17) 4(18)3 42.52(19) .0x65.1(20)1.6: : 03(21)3 163102(22)x:1 :972132(23)47.1 12.5(24):0.6 :431(25) : :3279
2、(26) 0.329.1(27) x5.60(28) x 2148(29) : : 1(30) : :(31)3+ 2413(32) : 0.3: 157(33)13189.2(34) :0.2580: 3(35)4 7.112.5(36) 4215(37) 332(38) : :12(39) =2107(40) : =12:343(41)2.40.452=0.3(42) : =:0.118(43)6.3 5=4.1(44)1.25:5=0.75:3(45) := :62143(46) 2.5=0.65(47) =6125(48) : = :317(49) =0x.(50) +1.2=3.42(51)4:6=15:(52) : =:2143