(x^2+y^2-1)^3=x^2*y^3 图像如何用几何画板画
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x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
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(x-y)^2+(x+y)(x-y) 其中 X =3 Y=-1
x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=?
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已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙