题目内容
用递等式计算
37.5÷[0.3×(1.34-0.84)]
(2.5+27.75÷1.5)×1.6.
37.5÷[0.3×(1.34-0.84)]
(2.5+27.75÷1.5)×1.6.
分析:这两个题按照先算乘除,再算加减,有括号的先算括号里面的运算顺序计算.
解答:解:(1)37.5÷[0.3×(1.34-0.84)],
=37.5÷[0.3×0.5],
=37.5÷0.15,
=250;
(2)(2.5+27.75÷1.5)×1.6,
=(2.5+18.5)×1.6,
=21×1.6,
=33.6.
=37.5÷[0.3×0.5],
=37.5÷0.15,
=250;
(2)(2.5+27.75÷1.5)×1.6,
=(2.5+18.5)×1.6,
=21×1.6,
=33.6.
点评:解决计算题目要看清楚先算什么,再算什么,能否简算,不能简算的不要改变运算顺序.
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