7|x-2y+2|=-15(3x+2y-4)^2,则(x+y)^2=
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7|x-2y+2|=-15(3x+2y-4)^2,则(x+y)^2=
∵15(3x+2y-4)^2 ≥ 0,7|x-2y+2| ≥ 0
又:7|x-2y+2|=-15(3x+2y-4)^2
∴15(3x+2y-4)^2 = 0,7|x-2y+2| = 0
3x+2y-4=0
x-2y+2=0
x=1/2,y=5/4
(x+y)^2=(1/2+5/2)^2=9
又:7|x-2y+2|=-15(3x+2y-4)^2
∴15(3x+2y-4)^2 = 0,7|x-2y+2| = 0
3x+2y-4=0
x-2y+2=0
x=1/2,y=5/4
(x+y)^2=(1/2+5/2)^2=9
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