102×20.03-1.25×20.03×0.8.

解:102×20.03-1.25×20.03×0.8,
=20.03×(102-1.25×0.8),
=20.03×(102-1),
=20.03×101,
=20.03×(100+1),
=20.03×100+20.03×1,
=2003+20.03,
=2023.03;
分析:根據(jù)乘法分配律的逆運(yùn)算,同時提取20.03然后進(jìn)行計算,計算出結(jié)果后把101看成(100+1)再次使用乘法分配律.
點評:此題考查的目的是理解乘法分配律的逆運(yùn)算,并且能夠靈活運(yùn)用乘法分配律進(jìn)行簡便計算.
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4.7+2.3= 4.5×2= 6.9-2.5= 7.2×0.8=
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