(2009.呼和浩特)若lx-2y+1l+l2x-y-5l=0,则x+y=

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(2009.呼和浩特)若lx-2y+1l+l2x-y-5l=0,则x+y=(2009.呼和浩特)若lx-2y+1l+l2x-y-5l=0,则x+y=(2009.呼和浩特)若lx-2y+1l+l2x-y

(2009.呼和浩特)若lx-2y+1l+l2x-y-5l=0,则x+y=
(2009.呼和浩特)若lx-2y+1l+l2x-y-5l=0,则x+y=

(2009.呼和浩特)若lx-2y+1l+l2x-y-5l=0,则x+y=
因为绝对值都是≥0的,由非负性可得
x-2y+1=0
2x-y-5=0
解得,
x=11/3,y=7/3
所以,x+y=6