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第1个回答 2018-06-23
8/17-5/9+7/17-4/9
=(8/17+7/17)-(5/9+4/9)
=15/17-1
=-2/17本回答被网友采纳
=(8/17+7/17)-(5/9+4/9)
=15/17-1
=-2/17本回答被网友采纳
第2个回答 2018-06-23
8/17-5/9+7/17-4/9
=(8/17+7/17)-(5/9+4/9)
=15/17-1
=-2/17
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=(8/17+7/17)-(5/9+4/9)
=15/17-1
=-2/17
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