3.75×4.23×36-125×0.423×2.8.

解:3.75×4.23×36-125×0.423×2.8,
=3.75×4.23×36-12.5×4.23×2.8,
=4.23×(3.75×36-12.5×2.8),
=4.23×(12.5×0.3×36-12.5×2.8),
=4.23×12.5×(0.3×36-2.8),
=4.23×12.5×(10.8-2.8),
=4.23×12.5×8,
=423.
分析:根據(jù)題意,把3.75拆成12.5×0.3,125×0.423×2.8根據(jù)積不變的規(guī)律,看作12.5×4.23×2.8,然后再根據(jù)乘法分配律進(jìn)行計(jì)算即可;
點(diǎn)評(píng):解答此題首先運(yùn)用轉(zhuǎn)化的思想和方法,把有關(guān)的數(shù)據(jù)進(jìn)行轉(zhuǎn)化,然后運(yùn)用乘法分配律進(jìn)行簡(jiǎn)算.
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