4/5x(5/6+3/4)+2/5
=2/3+3/5+2/5
=2/3+1
=1又2/3
(1/4+1/5)x4x5
=5+4
=9
6x11/8+15/(8/11)-11/8x5
=11/8x(6+15-5)
=11/8x16
=22谢谢，还有个连线，你告诉我就采纳你。是这样的：3分之2和6:30还是0.1:0.4还是16:20还是2:6还是2:8还是5分之1:1？好像都不是2/3哦，你再看看写错了吧没啊