47×45/46+22×22/23用简便方法

问题描述:

47×45/46+22×22/23用简便方法

47×45/46+22×22/23
=(46+1)x45/46+22x(1-1/23)
=46x45/46+45/46+22-22x1/23
=45+45/46-22-22/23
=23-1/46
=22又45/46
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