问题
解答题
1-4x2-4y2+8xy.
答案
1-4x2-4y2+8xy,
=1-(4x2+4y2-8xy),
=1-4(x-y) 2,
=[1-2(x-y)][1+2(x+y)],
=(1+2x-2y)(1-2x+2y).
1-4x2-4y2+8xy.
1-4x2-4y2+8xy,
=1-(4x2+4y2-8xy),
=1-4(x-y) 2,
=[1-2(x-y)][1+2(x+y)],
=(1+2x-2y)(1-2x+2y).