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简便运算：28/29X8/9+15/63X7/15X28/29
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简便运算：28/29X8/9+15/63X7/15X28/29
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答案和解析
28/29X8/9+15/63X7/15X28/29
=28/29X8/9+(15/63X7/15)X28/29
=28/29X8/9+1/9X28/29
=28/29X(8/9+1/9)
=28/29X1
=28/29
=28/29X8/9+(15/63X7/15)X28/29
=28/29X8/9+1/9X28/29
=28/29X(8/9+1/9)
=28/29X1
=28/29
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