6.4×4.2+4.2×4.6-4.2.

解:6.4×4.2+4.2×4.6-4.2,
=4.2×(6.4+4.6-1),
=4.2×10,
=42;
分析:注意題目中的數(shù)據(jù),6.4與4.6不要看錯(cuò)了,運(yùn)用乘法的分配律進(jìn)行計(jì)算.
點(diǎn)評:完成本題要注意分析式中數(shù)據(jù),運(yùn)用合適的簡便方法計(jì)算.
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