A-A+

计算:(1)6-(3)-(-7)+(-2);(2)-0.5-(-314)+2.75-7;(3

2022-08-15 16:13:24 问答库 阅读 207 次

问题详情

计算:
(1)6-(3)-(-7)+(-2);
(2)-0.5-(-31

4

)+2.75-7;
(3)-|-9|×|-12

3

|-(10);
(4)-22×2-3×(-1)2
(5)(2

3

-1

12

-1

15

)÷(-1

60

);
(6)-9971

72

×36(用简便方法计算).

参考答案

(1)6-(+3)-(-7)+(-2)
=6-3+7-2
=8;

(2)-0.5-(-314)+2.75-7
=-0.5+3.25+2.75-7
=(-0.5-7)+(3.25+2.75)
=-7.5+6
=-1.5;

(3)-|-9|×|-123|-(10)
=-9×53-10
=-15-10
=-25;

(4)-22×2-3×(-1)2
=-4×2-3×1
=-8-3
=-11;

(5)(23-112-115)÷(-160)
=(23-112-115)×(-60)
=-40+5+4
=-31;

(6)-997172×36
=(-100+172)×36
=-3600+12
=-359912.

考点: