问题 解答题
计算下面各题,注意运用简便方法.
30.3÷[(1.3+1.2)×0.6]0.59×7.2-7.2×0.391.25×7.4×81.6-0.2÷5×40.
答案

(1)30.3÷[(1.3+1.2)×0.6],

=30.3÷[2.5×0.6],

=30.3÷1.5,

=20.2;

(2)0.59×7.2-7.2×0.39,

=(0.59-0.39)×7.2,

=0.2×7.2,

=1.44;

(3)1.25×7.4×8,

=1.25×8×7.4,

=10×7.4,

=74;

(4)1.6-0.2÷5×40,

=1.6-0.04×40,

=1.6-1.6,

=0.

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