问题 解答题
脱式计算.
①(
3
5
-
1
4
)×(1-
3
7

5
7
×
21
12
+
1
5
÷
4
5

③[1-(
1
2
+
1
4
)]×
2
3
÷2
④(
15
11
+3.9+
7
11
+16.1)÷
5
6
答案

①(

3
5
-
1
4
)×(1-
3
7
),

=

7
20
×
4
7

=

1
5

5
7
×
21
12
+
1
5
÷
4
5

=

5
4
+
1
5
×
5
4

=

5
4
+
1
4

=

3
2

③[1-(

1
2
+
1
4
)]×
2
3
÷2,

=[1-

3
4
2
3
÷2,

=

1
4
×
2
3
÷2,

=

1
6
÷2,

=

1
12

④(

15
11
+3.9+
7
11
+16.1)÷
5
6

=[(

15
11
+
7
11
)+(3.9+16.1)]÷
5
6

=[2+20]÷

5
6

=22÷

5
6

=

132
5

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