(19又4/9＋9又4/19）÷（2又7/9＋1又6/19） 35又9/15×2/17

freewindows2022-10-04 11:39:542条回答

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淮安小头菜共回答了27个问题 | 采纳率81.5%: (19又4/9+9又4/19)÷(2又7/9+1又6/19)
=(175/9+175/19)÷(25/9+25/19)
=[175×(1/9+1/19)]÷[25×(1/9+1/19)]
=175÷25
=7
35又9/15×2/17
=35又3/5×2/17
=(34+8/5)×2/17
=34×2/17+8/5×2/17
=4+16/85
=4又16/85; 1年前

flybird1223 共回答了1个问题 | 采纳率: 约分; 1年前

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