X2+xy-12y2-2x+27y+5因式分解
问题描述:
X2+xy-12y2-2x+27y+5因式分解
答
X²+xy-12y²-2x+27y-15 最后一个数字是-15
=(x-3y)(x+4y)-5(x-3y)+3(x+4y-5)
=(x-3y)(x+4y-5)+3(x+4y-5)
=(x+4y-5)(x-3y+3)