4(b-a)²-4(c-b)(a-b)=0
谢谢~~化简一下下
4(b-a)²-4(c-b)(a-b)=0
谢谢~~化简一下下
4(b-a)²-4(c-b)(a-b)=4(a²+b²-2ab)-4(ac-bc-ab+b²)
=4(a²-ab-ac+bc)
=4[a(a-b)-c(a-b)]
=4(a-b)(a-c)
4(b-a)²-4(c-b)(a-b)=0
4(a-b)²-4(c-b)(a-b)=0
4(a-b)(a-b-c+b)=0
4(a-b)(a-c)=0
4b^2+4a^2-8ab-4b^2+4ab+4bc-4ac=0
4a^2-4ab-4ac=0
4a(a-b-c)=0
a(a-b-c)=0
a=0 或a-b-c=0