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

题目详情
(19又4/9+9又4/19)÷(2又7/9+1又6/19) 35又9/15×2/17
▼优质解答
答案和解析
(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