题目内容

计算下面的题,能简算的要用简便方法计算哟,并写出简算步骤.
①2.35-81÷27×0.45②125×
5
3
×0.8×
3
10

③3×(
2
15
+
1
12
)-
2
5
④[1-(
1
4
+
3
8
)]÷
1
4
①2.35-81÷27×0.45,
=2.35-3×0.45,
=2.35-1.35,
=1;

②125×
5
3
×0.8×
3
10

=(125×0.8)×(
5
3
×
3
10
),
=100×
1
2

=50;

③3×(
2
15
+
1
12
)-
2
5

=3×
13
60
-
2
5

=
13
20
-
2
5

=
1
4


④[1-(
1
4
+
3
8
)]÷
1
4

=[1-
5
8
]×4,
=
3
8
×4,
=
3
2
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