y^2=x^3-3x^2+2x x^2=y^3-3x^2+2y 解方程组rt

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y^2=x^3-3x^2+2x x^2=y^3-3x^2+2y 解方程组rt
y^2=x^3-3x^2+2x x^2=y^3-3x^2+2y 解方程组
rt

y^2=x^3-3x^2+2x x^2=y^3-3x^2+2y 解方程组rt
y^2=x^3-3x^2+2x
x^2=y^3-3y^2+2y
两式相减得：y^2-x^2=(x^3-y^3)-3(x^2-y^2)+2(x-y)
(x-y)(x^2+xy+y^2-2x-2y+2)=0
所以x-y=0,再代入1）式得：x^3-2x^2+2x=0,即x(x^2-2x+2)=0,得：x=0,故y=0,即(0,0)为一组解
或x^2+xy+y^2-2x-2y+2=0,化为x^2+x(y-2)+y^2-2y+2=0
delta=(y-2)^2-4(y^2-2y+2)=y^2-4y+4-4y^2+8y-8=-3y^2+4y-4=-(3y^2-4y+4)

3^x+2x=y,x 函数,y=3x/(x^2+x+1) ,x 函数y=3x/(x^2+x+1) （x (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= (x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) (x+y)(2x-3y)=? x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 (x^3-2x^2+xy^2)/(x-y)+(x+y)(y-x)=? 若2x=3y,则(x*x+y*y)/x*x=? [2/3x-2/x+y(x+y/3x-x-y)]/x-y/x 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x x(x-y)2-(y-x)3 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 y=(2x*x-2x+3)/(x*x-x+1),求值域? 求值域 1,y=(x+2)/(x*x+3x+6) 2,y=3x/(x*x+4)