七年级数学有理数计算题分类及混合运算练习题(200 题) 有理数加法 1、(-9)+(-13) 4、67+(-92) 2、(-12)+27 5、 (-27.8)+43.9 3、(-28)+(-34) 6、(-23)+7+(-152)+65 原则一:所有正数求和,所有负数求和,最后计算两个数的差,取绝对值较大的数的符号。 7、| +(- )| = 8、(- )+|― | = 9、 38+(-22)+(+62)+(-78)= 10、(-8)+(-10)+2+(-1) 12、(-8)+47+18+(-27) 11、(- )+0+(+ )+(- )+(- ) 13、(-5)+21+(-95)+29 14、(-8.25)+8.25+(-0.25)+(-5.75)+(-7.5) 15、 6+(-7)+(-9)+2 16、 72+65+(-105)+(-28) 18、19+(-195)+47 17、(-23)+|-63|+|-37|+(-77) 18、(+18)+(-32)+(-16)+(+26) 20、(-0.8)+(-1.2)+(-0.6)+(-2.4) 21、(-8)+(-3 )+2+(- )+12 22、 5 +(-5 )+4 +(- ) 23、(-6.37)+(-3 )+6.37+2.75 原则二:凑整,0.25+0.75=1 0.25+ =1 抵消:和为零 + =1 有理数减法 7-9 = ―7―9 = 8.2―(―6.3) = 0-(-9) = (-3 )-5 = (-12.5)-(-7.5) = ―1―(- )―(+ ) (-26)―(-12)―12―18 =-44 =-2 (-23)―(-59)―(-3.5) =-23 )―(- )―(- )― =― =-10 )―3―(-3.2)―7 (+ )―(- )― (+6.1)―(-4.3)―(-2.1)―5.1 =7.4 (- )―(-1 )―(-1 )―(+1.75) =1 (- |-32|―(-12)―72―(-5) =0 (-0.5)-(-3 )+6.75-5 =4 (- )―(- )― = (-20)-(+5)-(-5)-(-12) =-8 =39.5 (+ (-25)-(-13) = (-3 )―(-2 )―(-1 )―(-1.75) =2.5 -8 -5 +4 -3 -4 + +(- )― =-13 =-7 0.5+(- )-(-2.75)+ =3.5 (+4.3)-(-4)+(-2.3)-(+4) =2 原则三:结果的形式要与题目中数的形式保持一致。如确定是分数还是小数,分数必须是带 分数或真分数,不得是假分数,过程中无所谓。 有理数乘法 (-9)× (- =-6 )×(-0.26) =0.04 (-2)×31×(-0.5) =31 ×(-5)+ ×(-13) (-4)×(-10)×0.5×(-3) (- )× ×(-1.8) =-6 =-60 =0.9 (-0.25)×(- )×4×(-7) =-4 (- )×(- )×(- =- (-8)×4×(- )×(-0.75) =-12 ( -1 + ) 4×(-96)×(-0.25)× =2 )×56 =32—63+12 =19 ( ― ― )×36 =30—27—28 =-25 (- )×(8- -0.4) =-6+1+0.3 =-4.7 (-66)×〔1 =-66-63-22+55 =-96 25× -(-25)× +25× =25×( + + ) =25×1 =37 原则四:巧妙运用运算律 -(- )+(- (-36)×( + - =-16-30+21 =-25 ) )〕 ( + - + )×72 - )×(- )×(- ×(2 =28+54-60+56 = ×( )×(- )×(- ) =78 = 有理数除法 18÷(-3) (-24)÷6 (-57)÷(-3) (- )÷ = -6 (+ =-4 =19 )÷(- ) =- (- =- =- )÷9 0.25÷(- ) =-40 = -3÷( - ) =-36 =4 1 ÷(-3)×(- ) 0÷[(-3 )×(-7)] =0 (-24 )÷(-6) = -36÷(-1 )÷(- ) 3÷(- )×(- ) = 2÷(5-18)× =- - ×(- =- )÷(- ) =-6 ( - )÷(- ) = ( - + )÷(- ) -3.5 ×( -0.5)× ÷ =- ×(- )× ×2 =-6+ -1 =1 =- × -1 ÷(-1 )×1 ×(-7) × ×7 =- =-6 ×(- - )÷ =- × × (-42)÷(-6) =7 =-2 (-1)÷(-4)÷ ) ÷(-2 )- × - ÷4 = ×(- )- × - × =-4 =- =- ×( + +1 ) × =-1 原则五:结果的形式要与题目中数的形式保持一致。如确定是分数还是小数,分数必须是带 分数或真分数,不得是假分数,过程中无所谓。 0.8× +4.8×(- )-2.2÷ +0.8× =0.8×( + )- = - - =- -5 =- × - × - =- -5 =-5 有理数混合运算 (- )×(-15×4) =10+9-48+35 (-2.4) = =6 2÷(- )× ÷(-5 ) [15 -(1 ÷1 +3 )]÷(-1 ) =[15 - × -3 ]× = = =[12- × ]× × = =9 ×(-5)÷(- )×5 =25 -( - =( - + - )÷(- ) + - )×42 =14-2+9-12=9 -13× -0.34× + ×(-13)- ×0.34 8-(-25)÷(-5) =[-13× + ×(-13)]-0.34× - ×0.34 =3 =-13-0.34=-13.34 (-13)×(-134)× ×(- ) (-4 )-(-5 )+(-4 )-3 =-2 =-8+1 =-6 (-16-50+3 )÷(-2) (-0.5)-(-3 )+6.75-5 =8+25-1 =(-0.5)-5 +6.75-(-3.25) =31 =4 178-87.21+43 +53 -12.79 =178-87.21-12.79+43 (-6)×(-4)+(-32)÷(-8)-3 +53 =178-100+97 =175 - -(- )+|-1 | =24+4-3 =25 (-9)×(-4)+ (-60)÷12 =1 =36-6=31 [(- )-1 + =[- - + ]÷(- ]×(-42) =27+72-16=83 -1 ×( -|-3|÷10-(-15)× ) - =- =-4.22 )÷2 (2 -3 +1 =( - + =( - + = =14-21+ 有乘方的运算: -2× - - =-18 =-3 =17 =-68 = )÷(-1 )×(-7) )×(- )×(-7) )×6 =4 - + × =- =-6+ +0.03=-6+1.75+0.03 =4 )× =- ×(- +5 - ×(8-2 -0.04) -2× =-1+2=1 × × = =4096 =-6×9=-54 ÷ =9÷16= × = × - × + + =2 - =-4-27+1 =- =-30 0- × =4× × - 6+ × - -10+8÷ × =5 -4×3 =-20 -(1-0.5)× =-1-1=-2 =-1- =-1 +6 =42 × × × - +2× +(-6)÷ =-49+18-54=-97 ÷(-8)- ×(- =-2- =-2 ) ×( )× =0 -2[ -3× =4+4×5=24 ]÷ ÷9÷ 36× =9 -{ =1 } =-{-27-3.3}=30.3 =4+16=20 × =-4 × = -4× ÷ =-1+32=31 - - 4× + + ÷ =1 ×(- +1) ×0 =0 - =0 ÷3× =24 - × + - +(1-0.5)× ×[2× ] =-1+3=2 - - =-27+2-18=-43 + × ÷ 过关测试 2. =-18 =- 3. =0 4. =-23 6. 5. =4 =3 8. 1. =-8 =-45 10. 9. =-28 =1 11. =8+25-1 =31 12. =-48+8-80 =-120 14. 13. =- =-1 16. 15. =9 = 18. 17. =-1+ =81× = =-20 × =1 20. 19. =-25-[-4- × ] =(-5-7+12) ×(-3 ) =0 22. 21. =-10-80 =-90 =9- =- -9
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