题目

1.因式分解x^2 y - y^2 z + z^2 x-x^2 z +y^2 x + z^2 y -2xyz
2.x^2 - (m^2 + n^2 ) x +mn (m^2 -n^2 )
3.(c-2 )^2 - 4 (b-c)(a-b)

提问时间：2021-02-09

答案

1.因式分解x^2 y - y^2 z + z^2 x-x^2 z +y^2 x + z^2 y -2xyz =z^2(x+y)+xy*(x+y)-z(x^2+2xy+y^2) =z^2(x+y)+xy(x+y)-z(x+y)^2=(x+y)*(z^2+xy-zx-zy)=(x+y)[z(z-x)-y(z-x)]=(x+y)(Z-x)(z-y) 2.x^2 - (m^2 + n^2 ) x...