计算521乘以520分之521的简便方法?
3个回答
展开全部
521×521/520
=(520+1)×521/520
=520×521/520+1×521/520
=521+521/520
=522又1/520
=(520+1)×521/520
=520×521/520+1×521/520
=521+521/520
=522又1/520
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展开全部
521×521/520
=521×(1+1/520)
=521×1+521×1/520
=521+(520+1)×1/520
=521+520×1/520+1×1/520
=521+1+1/520
=522又1/520
=521×(1+1/520)
=521×1+521×1/520
=521+(520+1)×1/520
=521+520×1/520+1×1/520
=521+1+1/520
=522又1/520
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