1 有理数加法 脱式计算 (-9 )+(-1 3 ) (-1 2 )+2 7 (-2 8 )+(-3 4 ) 6 7 +(-9 2 ) (-2 7 .8 )+4 3 .9 (-2 3 )+7 +(-1 5 2 )+6 5 |52 +(-31 )| (-52 )+|―31 | 3 8 +(-2 2 )+(+6 2 )+(-7 8 ) (-8 )+(-1 0 )+2 +(-1 ) (-32 )+0 +(+ 41 )+(-61 )+(-21 ) (-8 )+4 7 +1 8 +(-2 7 ) (-5 )+2 1 +(-9 5 )+2 9 (-8 .2 5 )+8 .2 5 +(-0 .2 5 )+(-5 .7 5 )+(-7 .5 ) 6 +(-7 )+(9 )+2 7 2 +6 5 +(-1 0 5 )+(-2 8 ) (-2 3 )+|-6 3 |+|-3 7 |+(-7 7 ) 1 9 +(-1 9 5 )+4 7 (+1 8 )+(-3 2 )+(-1 6 )+(+2 6 ) (-0 .8 )+(-1 .2 )+(-0 .6 )+(-2 .4 ) (-8 )+(-3 21 )+2 +(-21 )+1 2 5 53 +(-5 32 )+4 52 +(-31 ) (-6 .3 7 )+(-3 43 )+6 .3 7 +2 .7 5 2 有理数减法 脱式计算 7 -9 ―7 ―9 0 -(-9 ) (-2 5 )-(-1 3 ) 8 .2 ―(―6 .3 ) (-3 21 )-5 41 (-1 2 .5 )-(-7 .5 ) (-2 6 )―(-1 2 )―1 2 ―1 8 ―1 ―(-21 )―(+ 23 ) (-2 0 )-(+5 )-(-5 )-(-1 2 ) (-2 3 )―(-5 9 )―(-3 .5 ) |-3 2 |―(-1 2 )―7 2 ―(-5 ) (-41 )―(-85 )― 81 (+ 1 03 )―(-74 )―(-52 )― 71 0 (-51 6 )―3 ―(-3 .2 )―7 (+ 71 )―(-72 )― 73 (+6 .1 )―(-4 .3 )―(-2 .1 )―5 .1 (-32 )―(-1 43 )―(-1 32 )―(+1 .7 5 ) (-3 32 )―(-2 ) 43 ―(-1 32 )―(-1 .7 5 ) -8 43 -5 97 +4 61 -3 92 -4 43 + 61 +(-32 )― 25 0 .5 +(-41 )-(-2 .7 5 )+ 21 (+4 .3 )-(-4 )+(-2 .3 )-(+4 ) (-0 .5 )-(-3 41 )+6 .7 5 -5 21 3 有理数乘法 脱式计算 (-9 )× 32 (-1 32 )×(-0 .2 6) (-2 )×3 1 ×(-0 .5 ) 31 ×(-5 )+ 31 ×(-1 3 ) (-4 )×(-1 0 )×0 .5 ×(-3 ) (-83 )× 34 ×(-1 .8 ) (-0 .2 5 )×...