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

7
9
÷
11
5
+
2
9
×
5
11
答案

(1)

8
9
×[
3
4
-(
7
16
-
1
4
)],

=

8
9
×(
3
4
-
3
16
),

=

8
9
×
3
4
-
8
9
×
3
16

=

2
3
-
1
6

=

1
2

(2)[

1
2
-(
3
4
-
3
5
)]÷
7
10

=(

1
2
-
3
20
)÷
7
10

=

7
20
÷
7
10

=

1
2

(3)

7
9
÷
11
5
+
2
9
×
5
11

=

7
9
×
5
11
+
2
9
×
5
11

=

5
11
×(
7
9
+
2
9
),

=

5
11
×1,

=

5
11

判断题
不定项选择