有三道因式分解1.x²-6xy+9y²-3x+9y+2,

问题描述:

有三道因式分解1.x²-6xy+9y²-3x+9y+2,
2.x²+xy-6y²-6x+2y+8,3.m²-2mn+n²-5m+5n+6.

x²-6xy+9y²-3x+9y+2=(x-3y)²-3(x-3y)+2=(x-3y-2)(x-3y-1)x²+xy-6y²-6x+2y+8=(x+3y)(x-2y)-6x+2y+8=(x+3y-4)(x-2y-2)m²-2mn+n²-5m+5n+6=(m-n)²-5(m-n)+6=(m-n-3)(m-...