几道初一因式分解·分组分解法的题,快
问题描述:
几道初一因式分解·分组分解法的题,快
1,c²+a²-b²+2ac
2,2a²-2+2b²-4ab
3,x^3+x²y-x²z-xyz
答
c²+a²-b²+2ac
=(a+c)²-b²
=(a+c-b)(a+c+b)
2a²-2+2b²-4ab
=2(a²-2ab+b²)-2
=2[(a-b)²-1]
=2(a-b-1)(a-b+1)
x^3+x²y-x²z-xyz
=x²(x+y)-xz(x+y)
=(x²-xz)(x+y)
=x(x-z)(x+y)