问题 解答题
计算下列各题.
7
12
÷
2
3
×
4
7

5
7
+
1
2
)÷(
4
5
-
2
3

9
17
÷
4
3
+
3
4
×
8
17

3
4
÷(
1
2
-
3
8

45×(
4
9
+
7
15
答案

(1)

7
12
÷
2
3
×
4
7

=

7
8
×
4
7

=

1
2

(2)(

5
7
+
1
2
)÷(
4
5
-
2
3
),

=

17
14
÷
2
15

=

255
28

(3)

9
17
÷
4
3
+
3
4
×
8
17

=

9
17
×
3
4
+
3
4
×
8
17

=(

9
17
+
8
17
)×
3
4

=1×

3
4

=

3
4

(4)

3
4
÷(
1
2
-
3
8
),

=

3
4
÷
1
8

=6;

(5)45×(

4
9
+
7
15
),

=45×

4
9
+45×
7
15

=20+21,

=41.

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