x-y+2=0,4x^2-y^2=12,怎么解
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x-y+2=0,4x^2-y^2=12,怎么解
x-y+2=0,4x^2-y^2=12,怎么解
x-y+2=0,4x^2-y^2=12,怎么解
x-y+2=0
y=x+2
代入
4x²-x²-4x-4=12
3x²-4x-16=0
x=(4±√208)/6
所以
x=(2-2√13)/3,y=(8-2√13)/3
x=(2+2√13)/3,y=(8+2√13)/3
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
(X,Y) f(x,y)={12y^2,0
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X×X-2XY-Y×Y+2X-2Y+2=02X×2X-4XY-2Y×2Y+3X-3Y+4=0X×X+2XY+Y×Y+X+Y-56=0X×X-2XY+Y×Y-X+Y-12=0X×X-3XY+Y×Y=-13X×3X-XY+3Y×3Y=13 两个在一起的方程之间有所联系(要求一步一步写出来)
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