用简便方法计算4.2*17+1.7*56+3.4
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用简便方法计算4.2*17+1.7*56+3.4
用简便方法计算4.2*17+1.7*56+3.4
用简便方法计算4.2*17+1.7*56+3.4
4.2*17+1.7*56+3.4
=42×1.7+1.7×56+1.7×2
=1.7×(42+56+2)
=1.7×100
=170