2.18+7.2-[4.2-1.82]怎样用简便方法算

问题描述:

2.18+7.2-[4.2-1.82]怎样用简便方法算

2.18+7.2-[4.2-1.82]
=(2.18+1.82)+(7.2-4.2)
=4+3
=7
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