一:填空题.1.x^n/x^n-1=_____2.(x-y)^2(y-x)^3=______(x-y)^53.x^2m/

一:填空题.
1.x^n/x^n-1=_____
2.(x-y)^2(y-x)^3=______(x-y)^5
3.x^2m/x^m-1=____(m是大于1的整数)
4.(3^2*y)(-2xy^2)=_____
5.-x(xy-xy^2)=_____
6.(x+2)(x-3)=_____
7.(x+4)(x-4)=_____
8.x^2+4y^2=(x-2y)^2+______
9.若x^2+mx+9是完全平方式,则m=_____
10.4a+4b,a^2-b^2,a^2+2ab+b^2:________(找出规律)
11.(a+2b)^2-______=(a-2b)^2
12.分解因式:a(a-b)-b(b-a)=______