lx-2l+ly+1/2l=0,求x+y的值
问题描述:
lx-2l+ly+1/2l=0,求x+y的值
答
lx-2l+ly+1/2l=0,
lx-2l>=0,ly+1/2l>=0,
x-2=0
y+1/2=0
x=2
y=-1/2
x+y=2-1/2=3/2