题目内容

脱式计算.
①168.1÷(4.3×2-0.4)
②(
11
12
-
3
4
)÷(6×
1
4

③1.6÷(
2
5
+2.5×80%)
④[
1
2
-(
3
4
-
3
5
)]÷
7
10
①168.1÷(4.3×2-0.4),
=168.1÷(8.6-0.4),
=168.1÷8.2,
=20.5;
②(
11
12
-
3
4
)÷(6×
1
4
),
=(
11
12
-
9
12
)÷
3
2

=
1
6
×
2
3

=
1
9

③1.6÷(
2
5
+2.5×80%),
=1.6÷(0.4+2.5×0.8),
=1.6÷(0.4+2),
=1.6÷2.4,
=
2
3

④[
1
2
-(
3
4
-
3
5
)]÷
7
10

=[
1
2
-(
15
20
-
12
20
)]÷
7
10

=[
1
2
-
3
20
]÷
7
10

=
7
20
×
10
7

=
1
2
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