问题 解答题
8
9
×[
3
4
-(
7
16
-
1
4
)]
[
1
2
-(
3
4
-
3
5
)]÷
7
10
答案

(1)

8
9
×[
3
4
-(
7
16
-
1
4
)],

=

8
9
×[
3
4
-(
7
16
-
4
16
)],

=

8
9
×[
3
4
-
3
16
],

=

8
9
×[
12
16
-
3
16
],

=

8
9
×
9
16

=

1
2

(2)[

1
2
-(
3
4
-
3
5
)]÷
7
10

=[

1
2
-(
15
20
-
12
20
)]÷
7
10

=[

1
2
-
3
20
7
10

=[

10
20
-
3
20
7
10

=

7
20
×
10
7

=

1
2

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