计算(1)4−(−3)×(−1)−8×(−12)3×|−2−3| (2)(−5)3×(−35)−32÷(−2)2×(+5

1个回答

  • 解题思路:(1)(2)(6)按照有理数混合运算的顺序,先乘方后乘除最后算加减,有括号的先算括号里面的;

    (3)(4)先化简,再计算即可;

    (5)按照有理数混合运算的顺序,先乘除后算加减,有括号的先算括号里面的.

    (1)4−(−3)×(−1)−8×(−

    1

    2)3×|−2−3|

    =4-3+8×[1/8]×5

    =4-3+5

    =6;

    (2)(−5)3×(−

    3

    5)−32÷(−2)2×(+

    5

    4)

    =-125×(-[3/5])-32÷4×[5/4]

    =75-10

    =65;

    (3)13+(+7)-(-20)-(-40)-(+6)

    =13+7+20+40-6

    =74;

    (4)(-7)-(+5)+(+3)-(-9)

    =-7-5+3+9

    =-12+12

    =0;

    (5)18−6÷(−2)×(−

    1

    3)

    =18+3×(-[1/3])

    =18-1

    =17;

    (6)(−4)2×[−

    3

    4+(−

    5

    8)]

    =16×(-[11/8])

    =-22.

    点评:

    本题考点: 有理数的混合运算.

    考点点评: 本题考查的是有理数的运算能力.注意:

    (1)要正确掌握运算顺序,在混合运算中要特别注意运算顺序:先三级,后二级,再一级;有括号的先算括号里面的;同级运算按从左到右的顺序;

    (2)去括号法则:--得+,-+得-,++得+,+-得-.