有理数加减乘除乘方混合运算题.带答案20道,急急急

3+2^2×(-1/5)

解:原式=3+4×(-1/5)

=3-4/5

=11/5

18-6÷(-2)×(-1/3)

解:原式=18-(-3)×(-1/3)

=18-1

=17

(-3)^2×[-2/3+(-5/9)]

解:原式=9×(-11/9)

=-11

8+(-3)^2×(-2)

解:原式=8+9×(-2)

=8-18

=-10

100÷(-2)^2-(-2)÷(-2/3)

解:原式=100÷4-3

=25-3

=22

36×(1/2-1/3)^2

解:原式=36×(1/6)^2

=36×(1/36)

=1

12.7÷(-8/19)×0

解:原式=0

4×(-3)^2+6

解:原式=4×9+6

=36+6

=42

(-3/4)×(-8+2/3-1/3)

解:原式=(-3/4)×(-8+1/3)

=(-3/4)×(-23/3)

=23/4

(-2)^3-13÷(-1/2)

解:原式=(-8)-(-26)

=18

0-2^3÷(-4)^3-1/8

解:原式=0-8÷(-64)-1/8

=0+1/8-1/8

=0

(-2)^3×0.5-(-1.6)^2÷(-2)^2

解:原式=(-8)×(1/2)-(-8/5)^2÷4

=(-4)-(64/25)÷4

=(-4)-16/25

=-116/25

(-3/2)×[(-2/3)^2-2]

解:原式=(-3/2)×(4/9-2)

=(-3/2)×(-14/9)

=7/3

[(-3)^2-(-5)^2]÷(-2)

解:原式=(9-25)÷(-2)

=(-16)÷(-2)

=8

16÷(-2)^3-(-1/8)×(-4)

解:原式=16÷(-8)-1/2

=-2-1/2

=-5/2