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7/9 1/8 3/8 5/7简便运算?
1个回答
展开全部
7/9十1/8+3/8十5/7
=7/9+4/8十5/7
=7/9+1/2+5/7
=98/126十63/126十90/126
=251/126
=1又125/126
=7/9+4/8十5/7
=7/9+1/2+5/7
=98/126十63/126十90/126
=251/126
=1又125/126
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