题目内容
【题目】脱式计算,能简便的要简算.
57.5﹣3.25﹣16.75 125×3.2×25 ×16.31﹣2.31÷
6760÷13+17×25 4.82﹣5.2÷0.8×0.6 35÷×1﹣.
【答案】37.5;10000;10;945;0.92;
【解析】
试题分析:根据四则运算的顺序进行计算,能简算的要简算.
(1)运用a﹣b﹣c=a﹣(b+c)来进行计算.
(2)运用乘法结合律进行计算.
(3)运用用乘法分配律进行计算.
(4)、(5)、(6)可直接计算.
解:(1)57.5﹣3.25﹣16.75,
=57.5﹣(3.25+16.75),
=57.5﹣20,
=37.5;
(2)125×3.2×25,
=125×8×0.4×25,
=(125×8)×(0.4×25),
=1000×10,
=10000;
(3)×16.31﹣2.31÷,
=×16.31﹣2.31×,
=×(16.31﹣2.31),
=×14,
=10;
(4)6760÷13+17×25,
=520+425,
=945;
(5)4.82﹣5.2÷0.8×0.6,
=4.82﹣6.5×0.6,
=4.82﹣3.9,
=0.92;
(6)35÷×1﹣,
=35××1,
=40,
=.
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