5⼀7×7⼀17 5⼀28×17这道题怎么解?

2024-12-26 09:10:44
推荐回答(1个)
回答1:

原式=5/7x(7/17+17/4)
=5/7x(28/68+289/68)
=5/7x317/68
=1585/476
=3又157/476