9⼀4X(5⼀9十25⼀21X7⼀15)怎样计算? 能简便的要简便算.

2024-12-18 05:40:33
推荐回答(1个)
回答1:

9/4X(5/9十25/21X7/15)
=9/4X(5/9十5/9)
=9/4×5/18
=5/8