问题
解答题
递等式计算(能简便运算的要简便运算
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答案
(1)3.6×0.25×1.25,
=4×0.9×0.25×1.25,
=(4×0.25)×(0.9×1.25),
=1×1.125,
=1.125;
(2)8.7×10.1,
=8.7×10+8.7×0.1,
=87+0.87,
=87.87;
(3)(87.5+12.5)×0.8,
=100×0.8,
=80;
(4)9.6×6.2+0.96×38.
=9.6×6.2+9.6×3.8,
=9.6×(6.2+3.8),
=9.6×10,
=96.