问题 解答题
9×(
2
3
-
2
5
)÷
3
5
3
17
÷
3
4
+
3
17
×
4
3
1
2
+
2
3
)÷
3
4
-
2
3
8
9
×[
3
4
-(
7
16
-
1
4
)].
答案

(1)9×(

2
3
-
2
5
)÷
3
5

=9×(

10
15
-
6
15
)÷
3
5

=9×

4
15
×
5
3

=4;

(2)

3
17
÷
3
4
+
3
17
×
4
3

=

3
17
×
4
3
+
3
17
×
4
3

=

3
17
×
4
3
×2,

=

8
17

(3)(

1
2
+
2
3
)÷
3
4
-
2
3

=(

3
6
+
4
6
)×
4
3
-
2
3

=

7
6
×
4
3
-
2
3

=

14
9
-
6
9

=

8
9

(4)

8
9
×[
3
4
-(
7
16
-
1
4
)],

=

8
9
×[
3
4
-(
7
16
-
4
16
)],

=

8
9
×[
12
16
-
3
16
],

=

8
9
×
9
16

=

1
2

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