第1 页 有理数的加减法——计算题练习 1 、加法计算(直接写出得数,每小题 1 分): (1 ) (-6 )+(-8 )= (2 ) (-4 )+2 .5 = (3 ) (-7 )+(+7 )= (4 ) (-7 )+(+4 )= (5 ) (+2 .5 )+(-1 .5 )= (6 ) 0 +(-2 )= (7 ) -3 +2 = (8 ) (+3 )+(+2 )= (9 ) -7 -4 = (1 0 ) (-4 )+6 = (1 1 ) 31 = (1 2 ) aa = 2 、减法计算(直接写出得数,每小题 1 分): (1 ) (-3 )-(-4 )= (2 ) (-5 )-1 0 = (3 ) 9 -(-2 1 )= (4 ) 1 .3 -(-2 .7 )= (5 ) 6 .3 8 -(-2 .6 2 )= (6 ) -2 .5 -4 .5 = (7 ) 1 3 -(-1 7 )= (8 ) (-1 3 )-(-1 7 )= (9 ) (-1 3 )-1 7 = (1 0 ) 0 -6 = (1 1 ) 0 -(-3 )= (1 2 ) -4 -2 = (1 3 ) (-1 .8 )-(+4 .5 )= (1 4 ) 1143 = (1 5 ) 1( 6 .2 5 )3 4 = 3 、加减混合计算题(每小题 3 分): (1 ) 4 +5 -1 1 ; (2 ) 2 4 -(-1 6 )+(-2 5 )-1 5 (3 ) -7 .2 +3 .9 -8 .4 +1 2 (4 ) -3 -5 +7 (5 ) -2 6 +4 3 -3 4 +1 7 -4 8 (6 ) 9 1 .2 6 -2 9 3 +8 .7 4 +1 9 1 (7 ) 1 2 -(-1 8 )+(-7 )-1 5 (8 ) )1 5()4 1()2 6()8 3( (9 ) )2.0(3.1)9.0()7.0()8.1( (1 0 ) (-4 0 )-(+2 8 )-(-1 9 )+(-2 4 )-(3 2 ) (1 1 ) (+4 .7 )-(-8 .9 )-(+7 .5 )+(-6 ) (1 2 ) -6 -8 -2 +3 .5 4 -4 .7 2 +1 6 .4 6 -5 .2 8 第2 页 4 、加减混合计算题: (1 )53141 553266767 (2 ) (-1 .5 )+13 4+(+3 .7 5 )+14 2 (3 )41153141325 (4 ) 2223483121 31 355 (5 ) )7 5.1(321432323 (6 ...