问题
解答题
计算下面各题,能用简便算法的用简便算法
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答案
(1)12.25-3.1+0.85-6.17,
=12.25+0.85-3.1-6.17,
=13.1-3.1-6.17,
=10-6.17,
=3.83;
(2)2.65×1.7+1.35×1.7,
=(2.65+1.35)×1.7,
=4×1.7,
=6.8;
(3)6.9×10.1,
=6.9×10+6.9×0.1,
=69+0.69,
=69.69;
(4)0.125×25×80×0.4,
=(0.125×80)×(25×0.4),
=10×10,
=100.