当-3＜X＜Y＜-1时,化简lx-yl+ly+1l.不会做的智商太低了,额,当然我也是智商太低了……=-=lll

lx-yl+ly+1l
=y-x-y-1
=-x-1

依题得 x-y＜0 y+1＜0 所以lx-yl+ly+1l=y-x-y-1=-x-1

当-3因为x所以x-y所以lx-yl=y-x
因为y所以y+1所以|y+1|=-1-y
所以lx-yl+ly+1l=y-x-1-y
=-x-1