1.37×14-3.7×1.4 42÷[14-(50-30)]用简便方法计算
问题描述:
1.37×14-3.7×1.4 42÷[14-(50-30)]用简便方法计算
答
1.37×14-3.7×1.4
=1.4×(1.37-0.37)
=1.4×1
=1.4;
42÷[14-(50-30)]用简便方法计算
=42÷(14-20)
=42÷(-6)
=-7;
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