-x^2+2xy-y^2因式分解-x^2+2xy-y^23^2y(x-y)^2-6xy^2(y-x)^2y^2-2xy/5+x^2/25

Question

-x^2+2xy-y^2因式分解
-x^2+2xy-y^2
3^2y(x-y)^2-6xy^2(y-x)^2
y^2-2xy/5+x^2/25

Answer 1

-x^2+2xy-y^2
=-(x-y)²
3^2y(x-y)^2-6xy^2(y-x)^2
=3y(x-y)²(3--2x)
y^2-2xy/5+x^2/25=y²-2xy/5+x²/25
=(y-x/5)²