(a+b-c-d)^2-4(a-c)(b-d)因式分解
问题描述:
(a+b-c-d)^2-4(a-c)(b-d)因式分解
答
(a+b-c-d)^2-4(a-c)(b-d)=[(a-c)+(b-d)]²-4(a-c)(b-d)=(a-c)²+2(a-c)(b-d)+(b-d)²-4(a-c)(b-d)=(a-c)²-2(a-c)(b-d)+(b-d)²=[(a-c)-(b-d)]²=(a-b-c+d)²...