9x²-6x+y²-14y+50=0,试求①xy ②(x+y)²
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![9x²-6x+y²-14y+50=0,试求①xy ②(x+y)²](/uploads/image/z/11632605-69-5.jpg?t=9x%26%23178%3B-6x%2By%26%23178%3B-14y%2B50%3D0%2C%E8%AF%95%E6%B1%82%E2%91%A0xy+%E2%91%A1%28x%2By%29%26%23178%3B)
9x²-6x+y²-14y+50=0,试求①xy ②(x+y)²
9x²-6x+y²-14y+50=0,试求①xy ②(x+y)²
9x²-6x+y²-14y+50=0,试求①xy ②(x+y)²
9x²-6x+y²-14y+50=0,
9x²-6x+1+y²-14y+49=0,
(3x-1)^2+(y-7)^2=0
(3x-1)^2=0,x=1\3
(y-7)^2=0,y=7
所以
xy=7\3
(x+y)²
=(1\3+7)^2
=484\9