2x²+3y²-8x+6y+11=0,求x+y=( )求答= =
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2x²+3y²-8x+6y+11=0,求x+y=( )求答= =
2x²+3y²-8x+6y+11=0,求x+y=( )
求答= =
2x²+3y²-8x+6y+11=0,求x+y=( )求答= =
2(X一2)的平方十3(y十1)的平方=0所以X=2,y=-1