1、有理数加减混合运算习题(一)1将下列各式写成省略加号的和的形式,并合理交换加数的位置。(1) (+16)+(-29)-(+11)+(+9)= ;(2) (-3.1)-(-4.5) + (+4.4) - (+103) + (-2.5) = ;(3) (+ )-5+(- )-(+ )+(- )= ;31432(4) (-2.6)-(4.7)-(+0.5)+(+2.4)+(-3.2)= ;2计算:(1)59+3 (2)1017+8 (3)34+1911 (4)8+121623 (3)34+1911 (4)8+121623 (5)(+3.41)(0.59) (6) (7)9+(3 )+3 (8)-4.
2、2+5.7-8.4+10 751344(9)6.1-3.7-4.9+1.8 132)0(213654)1((12)(36)(25)(+36)+(+72) (13)(8)(3)+(+5)(+9) (14) (8)(3)+(+5)(+9) (15) )32(41)6(21(16) ; (17)4.7(8.9)7.5+(6)5.13.4256.34.1(18)(0.6)+1.7+(+0.6 )+(1.7 )+(9 ) (19) );7412(3654316543(20) (21) 1.8-(-1.2+2.1)-0.2-(-()()()1425314291631.5)(22) (23) ()()325
3、614381445(24) (- )+(+0.25)+(- )-(+ ) (25) (+3 )+(+4 )-(+1 )+(-3 )326125345243(26)10-(-8)+(-3)-(-5) (27)- -(- )-(- )+(- )32512(28)- - + - (29) -0.8-(-0.08)-(-0.8)-(-0.92)-(-9) 1697415(30)(-2.5)+(+ )+(- )+(+1 ) (31)- -0.25+ -(-0.125)+ -0.75 6521643(32)(- )+(- )(- )+ (33)-3 +(-1 )-2 + 218543712583478(3
4、4)-9 +(-13 )-8-(-7 )-(+ ) (35)-5 -(+9 )-(-17 )+(-237823178562343 )1(36)-4 -6 -(-2 )-(-0.8)-2 (37) (-121.4)+(-78.5)-(-8 )-(-121.4)23154512(38)-(-1 )+(- )+2 -(- )-(+4 ) (39)-5 -(+9 )-(-17 )+(-125634823562343 )11阅读第(1)小题的计算方法,再计算第(2)小题(1)计算:-5 -(+9 )-(-17 )+(-3 )5623412=-5 +(-9 )+(+17 )+(-3 )=(-5)+(-9)+17+(-3)+(- )+(- )+ +(- )563412=0+(-1 )=-1 14上面这种方法叫做拆项法(2)计算:(-2000 )+(-1999 )+4000 +(-1 ) 56234121、 (选作题:15 分)阅读观察下列解题过程:例:计算 10984312解:因为 )()(nnn所以 109843121= 109计算: 75