2X-y-3=0 求8-4x+2y
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2X-y-3=0求8-4x+2y2X-y-3=0求8-4x+2y2X-y-3=0求8-4x+2y8-4x+2y=-(4x-2y-8)=-2(2x-y-3-1)=-2(0-1)=22X-y-3=02x-
2X-y-3=0 求8-4x+2y
2X-y-3=0 求8-4x+2y
2X-y-3=0 求8-4x+2y
8-4x+2y
= -(4x-2y-8)
= -2(2x-y-3 -1)
= -2(0-1)
=2
2X-y-3=0
2x-y=3
8-4x+2y =8-(4x-2y)=8-2*(2x-y)=8-2*3=2
2x-y=3
8-4x+2y=8-2(2x-y)=8-2*3=2