问题 解答题
计算:
(1)(-1.25)+1
1
4

(2)(-6)-(+6)
(3)-22×(-3)2                   
(4)18-(+12)+(-21)+(+12)
(5)(-23)÷(-3)×
1
3

(6)(
1
2
+
5
6
-
7
12
)×(-36)

(7)(-2
4
5
×1
5
6
-0.25×5-
2
5
)×(-1)5
(8)(-3)×(-3
6
17
)+(+9)×(+3
6
17
)-(-12)×(-3
6
17
).
答案

(1)原式=-1.25+1.25

=0;

(2)原式=-6-6

=-12;

(3)原式=-4×9

=-36;

(4)原式=18-12-21+12

=-3;

(5)原式=

23
3
×
1
3

=

23
9

(6)原式=

1
2
×(-36)+
5
6
×(-36)-
7
12
×(-36)

=-18-30+21

=-27;

(7)原式=(-

14
5
×
11
6
-
1
4
×4-
2
5
)×(-1)

=(-

77
15
-1-
2
5
)×(-1)

=

98
15

(8)原式=3

6
17
×(3+9-12)

=0.

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