题目内容

脱式计算.
①(
1
2
-
3
8
)÷
3
4
②[1-(
1
4
+
3
8
)]÷
1
4


5
9
+
7
9
-1.625-2.375+3④[
1
2
-(
3
4
-
3
5
)]÷
7
10
①(
1
2
-
3
8
)÷
3
4

=
1
8
÷
3
4

=
1
6


②[1-(
1
4
+
3
8
)]÷
1
4

=(1-
5
8
)÷
1
4

=
3
8
×4
=1
1
2


5
9
+
7
9
-1.625-2.375+3
=
4
3
-4+3
=
4
3
-1
=
1
3


④[
1
2
-(
3
4
-
3
5
)]÷
7
10

=(
1
2
-
3
20
)÷
7
10

=
7
20
×
10
7

=
1
2
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