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13/7X9/5+13/4x9/7的简便算法
题目详情
13/7X9/5+13/4x9/7的简便算法
▼优质解答
答案和解析
13分之7 写作7/13
7/13x5/9+4/13x7/9
=7/13x5/9+7/13x4/9
=7/13x(5/9+4/9)
=7/13x1
=7/13
7/13x5/9+4/13x7/9
=7/13x5/9+7/13x4/9
=7/13x(5/9+4/9)
=7/13x1
=7/13
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