m^2-n^2 2m-2n
=[m n][m-n] 2[m-n]
=[m-n][m n 2]
x^2 x-m^2 m
=[x m][x-m] [x m]
=[x m][x-m 1]
a^2-b^2-2a 1
=[a-1]^2-b^2
=[a-b-1][a b-1]
(ax by)^2 (bx-ay)^2
=a^2x^2 b^2y^2 2abxy b^2x^2 a^2y^2-2abxy
=x^2[a^2 b^2] y^2[b^2 a^2]
=[a^2 b^2][x^2 y^2]
(a b)^2-4(a^2-b^2) 4(a-b)^2
=[a b]^2-4[a b][a-b] 4[a-b]^2
=[(a b)-2(a-b)]^2
=[(3b-a)]^2
其实这几道题目很简单,相信你一定是可以做得出的,好好努力吧,会取得好的成绩的.^是什么意思