试题:
计算题:
(1)-9-2+7 
(2)(-10 )÷2×
1
2
÷(-
3
4
)

(3)(
4
5
-
3
4
+
1
2
)×(-20)
(4)6÷(
3
2
-
1
3
+
5
6

(5)[(-2
3
7
)+9.8]-[(+7
4
7
)+(-1.2)]

答案:

我来补答
(1)-9-2+7=-11+7=-4;

(2)原式=(-10)×
1
2
×
1
2
×(-
4
3
)=
10
3


(3)原式=
4
5
×(-20)-
3
4
×(-20)+
1
2
×(-20)
=-16+15-10
=-11;

(4)原式=6÷(
9
6
-
2
6
+
5
6

=6÷
12
6

=3;

(5)原式=-2
3
7
+9.8-7
4
7
+1.2
=-10+11
=1.
 
 
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