试题:
计算下面各题.
(1)10
3
4
-(
3
4
+3
2
5

(2)7.2÷4÷0.9
(3)
2
3
+8×(
7
8
-
5
6

(4)(
1
2
+
3
4
)÷
5
6
×
3
5

答案:

我来补答
(1)10
3
4
-(
3
4
+3
2
5
),
=10
3
4
-
3
4
-3
2
5

=10-3
2
5

=6
3
5


(2)7.2÷4÷0.9,
=7.2÷(4×0.9),
=7.2÷3.6,
=2;

(3)
2
3
+8×(
7
8
-
5
6
),
=
2
3
+8×
7
8
-8×
5
6

=
2
3
+7-
20
3

=7
2
3
-6
2
3

=1;

(4)(
1
2
+
3
4
)÷
5
6
×
3
5

=
5
4
÷
5
6
×
3
5

=
3
2
×
3
5

=
9
10
 
 
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