4分之5乘13分之5+75%乘1又13分之8的简便算法
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答:依题意得
5/13×5/4+1又8/13×75%
=5/13×5/4+21/13×3/4
=1/13×25/4+1/13×63/4
=1/13×(25/4+63/4)
=1/13×22
=22/13
=1又9/13。
5/13×5/4+1又8/13×75%
=5/13×5/4+21/13×3/4
=1/13×25/4+1/13×63/4
=1/13×(25/4+63/4)
=1/13×22
=22/13
=1又9/13。
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