我本雄鹰
幼苗
共回答了9个问题采纳率:88.9% 举报
y2+zx=x2 => z=(x^2-y^2)/x
代入x2+yz=z2
=> x^4+xy(x^2-y^2)=(x^2-y^2)^2
=> x^4+x^3y-xy^3=x^4+y^4-2x^2y^2
=> x^3-xy^2-y^3+2x^2y=0
z2^+xy-y^2=x^2+yz+xy-y^2
=x^2+y(x^2-y^2)/x+xy-y^2
=x^2-y^3/x+2xy-y^2
=(x^3-xy^2-y^3+2x^2y)/x
=0/x(根据上式)
=0
=> z2^+xy=y^2
1年前
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