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用简便方法计算.38

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用简便方法计算.
3
8
用简便方法计算.38
(1)
3
8+3.75+
5
8+62.5%
=
3
8+
5
8+3.75+0.625
=1+3.75+0.625
=5.375,

(2)
4
9×35%+
5
9×0.35
=
4
9×0.35+
5
9×0.35
=(
4
9+
5
9)×0.35
=0.35;

(3)0.125×32×0.8
=0.125×0.8×32
=0.1×32
=3.2;

(4)24×(
1
4+
1
6-
1
8)
=24×
1
4+24×
1
6-24×
1
8
=6+4-3
=7.