14.2×4數(shù)學(xué)公式+5數(shù)學(xué)公式×14.2

解:14.2×4+5×14.2,
=14.2×(4+5),
=14.2×10,
=142.
分析:利用乘法的分配律變成14.2×(4+5)計算簡便.
點評:考查了運算定律與簡便運算,四則混合運算.注意運算順序和運算法則,靈活運用所學(xué)的運算律簡便計算.
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