因式分解1-4x平方-4y平方+8xy

因式分解1-4x平方-4y平方+8xy

1-4x- 4y+8xy =1-4(x+y+2xy)=1 - 4(x+y)=1- [2(x+y)] =[1+2(x+y)][1-2(x+y)] =(2x+2y+1)(1-2x-2y)