Question

8/15×2又1/2÷(6又2/3×0.28+6又2/3×72%)等于多少？

很急！在线等！

Answer 1

8/15×2又1/2÷(6又2/3×0.28+6又2/3×72%)
=8/15×5/2÷[6又2/3×（0.28+0.72）]
=4/3÷6又2/3
=4/3×3/20
=1/5
如有不明白，可以追问
如有帮助，记得采纳，谢谢

Answer 2

(4又2/3+0.75)*3又9/13/(5又4/45-4又1/6)*5又8/15除以34又2/7
=65/12*48/13/(83/90)*83/15÷240/7
=20×90/83*83/15÷240/7
=120÷240/7
=3.5