计算下面各题(能简算的要简算) 0.75×1.3+75%×8.73.2×25×12.5.
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解:(1)0.75×1.3+75%×8.7,
=0.75×1.3+0.75×8.7,
=0.75×(1.3+8.7),
=0.75×10,
=7.5;
(2)3.2×25×12.5,
=0.4×8×25×1.25,
=(0.4×25)×(8×12.5),
=10×100,
=1000.
解析分析:(1)先将75%化成0.75,再利用乘法分配律,即可简便计算;(2)先将3.2分解成0.4×8,再利用乘法分配律,将0.4与25相乘,将8和12.5相乘,进而得解.
点评:此题主要考查小数四则混合运算的顺序,要注意能简算的要简算.