问题 解答题
计算:
(1)6-(+3)-(-7)+(-2);
(2)-0.5-(-3
1
4
)+2.75-7;
(3)-|-9|×|-1
2
3
|-(10);
(4)-22×2-3×(-1)2
(5)(
2
3
-
1
12
-
1
15
÷(-
1
60
)

(6)-99
71
72
×36(用简便方法计算).
答案

(1)6-(+3)-(-7)+(-2)

=6-3+7-2

=8;

(2)-0.5-(-3

1
4
)+2.75-7

=-0.5+3.25+2.75-7

=(-0.5-7)+(3.25+2.75)

=-7.5+6

=-1.5;

(3)-|-9|×|-1

2
3
|-(10)

=-9×

5
3
-10

=-15-10

=-25;

(4)-22×2-3×(-1)2

=-4×2-3×1

=-8-3

=-11;

(5)(

2
3
-
1
12
-
1
15
÷(-
1
60
)

=(

2
3
-
1
12
-
1
15
)×(-60)

=-40+5+4

=-31;

(6)-99

71
72
×36

=(-100+

1
72
)×36

=-3600+

1
2

=-3599

1
2

单项选择题
名词解释