问题
解答题
能用简算的用简便算法计算,写出简算过程.
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答案
(1)5.4×2.08-5.4×1.08,
=5.4×(2.08-1.08),
=5.4×1,
=5.4;
(2)7.68×0.25×4,
=7.68×(0.25×4),
=7.68×1,
=7.68;
(3)8.2×2.5+17.5,
=20.5+17.5,
=38;
(4)(12.4+16.8)÷0.4,
=29.2÷0.4,
=73.
能用简算的用简便算法计算,写出简算过程.
|
(1)5.4×2.08-5.4×1.08,
=5.4×(2.08-1.08),
=5.4×1,
=5.4;
(2)7.68×0.25×4,
=7.68×(0.25×4),
=7.68×1,
=7.68;
(3)8.2×2.5+17.5,
=20.5+17.5,
=38;
(4)(12.4+16.8)÷0.4,
=29.2÷0.4,
=73.