问题 解答题
灵活计算下面各题.
(1)4.87×1.25×0.8(2)(5.6-5.6×0.7)÷22.4
(3)3.7×9.9(4)8.56×7.5+8.56×2.5.
答案

(1)4.87×1.25×0.8,

=4.87×(1.25×0.8),

=4.87×1,

=4.87;

(2)(5.6-5.6×0.7)÷22.4,

=(1-0.7)×5.6÷22.4,

=0.3×5.6÷22.4,

=1.68÷22.4,

=0.075;

(3)3.7×9.9,

=3.7×(10-0.1),

=3.7×10-3.7×0.1,

=37-0.37,

=36.63;

(4)8.56×7.5+8.56×2.5,

=8.56×(7.5+2.5),

=8.56×10,

=85.6.

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