有理数加减乘除乘方混合运算题.带答案20道,急急急

2020-09-24 教育 116阅读
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
声明:你问我答网所有作品(图文、音视频)均由用户自行上传分享,仅供网友学习交流。若您的权利被侵害,请联系fangmu6661024@163.com