x^2-25x

x^2-25x =x(x-25)
2x^2y^2-4y^3z =2y^2(x^2-2yz)
am-an+ap =a(m-n+p)
x^3-25x =x(x^2-25)=x(x+5)(x-5)
1-4x^2 =(1+2x)(1-2x)
25x^2+20xy+4y^2 =(5x+2y)^2
x^3+4x^2+4x=x(x^2+4x+4)=x(x+2)^2
4x^4-4x^3+x^2=x^2(4x^2-4x+1)=x^2(2x-1)^2
x^2-16ax+64a^2=(x+8a)^2
(x-1)(x-3)+1=x^2-4x+4=(x-2)^2
(ab+a)+(b+1）=a(b+1)+(b+1)=(a+1)(b+1)
其实这些题目都很简单,我相信你是可以做得出的,是吗,