求七年级上册有理数加减法的掌握方法,以及练习题【另附答案】.

1个回答

  • 关键是了解各种符号都是什么意思,都熟悉了就好了呗!

    下面是题:

    12+35+(-23)+0= 47-23=24

    (-6)+8+(-4)+12 = 10

    27+(-26)+33+(-27)=33-26=7

    39+[-23]+0+[-16]= 39-39=0

    [-18]+29+[-52]+60= 19

    [-3]+[-2]+[-1]+0+1+2= -3

    [-301]+125+301+[-75]= 125-75=40

    (-7分之1)+(-7分之2)+1又7分之3 =1

    -0.5-(-3 )+2.75-(+7 )2.75-10.5=-7.75

    39+[-23]+0+[-16]= 0

    [-18]+[-52]+60= -10

    [-3]+[-2]+[-1]+0+1+2= -3

    有的符号不好打 凑合凑合吧,我都抄袭别人的,有点不道德哈

    然后就是不带答案的了,相信你一定更行 ,看不懂的就不要了: ①  -5+(-3)=

    ② -10+15=

    ③ -6-9=

    ④ (-5)-(-4)=

    ⑤ (-8)-8=

    ⑥ (-2)-(-2)=

    ⑦  0-(-7)=

    ⑧  6.18-(-3.82)=

    ⑨ (-5.9)-(-6.9)=

    11 (- )+(- )=

    12 (- )- =

    13 ┃-8┃+┃-3┃=

    14 ┃-10┃-┃-5┃=

    15 (-4.2)÷(-1)=

    16 5÷0.01=

    17 -64÷16=

    18 (-5)÷(-1 )=

    19 (-17)×(-13)=

    20 (-0.03)÷0.01=

    21 (+24 )÷(-6)=

    22 (- )×(- )=

    23 -[-(-2)2]2=

    24 25×(-3)2 =

    25 (-2)2×(-3)3=

    26 74-22÷70=

    27 (-1 )2-23=

    28 (-2) +(-2) =

    29 -2 ×5=

    30 -3 ÷3=

    31

    32 ( ) =

    33 (-4+7)-(2-8)=

    34  - - + =

    35 -4 +1 -17 =

    36 (-2)×3×5÷(-1)=x09

    37 ( - )×60=

    38 -0.25÷(- )×(- )=

    39 (-10)×(-0.24)×(-0.1)=

    40 24÷3÷(-2)=

    41  ×( - )× ÷

    42 -20+8÷(-2)2-(-4)×(-3)=

    43 -3×(0.1)3×(-0.2)2+(-0.8)=

    44 42×(- )+(- )÷(-0.25)=

    45 -13-[-5+(1-0.2× )÷(-21)=

    46 -3×23-(-3×2)3=

    47 -5×(-3 )+(-7)×(-3 )+12×(-3 )=

    48  99 ×(-18)=

    49 -32-(-2)3- ÷( )3 =

    50  5 -[-0.25+(-2)3÷ ]- =