5/7 x 16/15 x 21/16 =116/15 x 9/8 x 5/6 =13/4 x 5/4 x 16/15 =1满意请采纳
3/4 5/4 16/15 求采纳
21/16*16/15*5/716/15*9/8*5/63/4*5/4*16/15