题目内容

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
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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