因式分解下列各题!（追加分数）我就剩50分全部奉上!
3ax^2-6ax
x^2(x-y)+y^2(y-x)
100(x-y)-5b(y-x)
8-2x^2
9x^2-25y^2
49(a+b)^2-25(a-b)^2
2x-12x+18
x^2+2xy+y^2-1
3(x+2)(x-5)-(x+2)(x-3)
m^2(p-q)-p+a
x^2-y^2-x-y
m^4+2m^2+1
7x-7y-x^2+2xy-y^2
x^2+y^2-1+2xy
ax+by+ay+bx
m^4-4m
2mx^2-4mx+2m
(x^2-y^2)-4x^2 y^2
ab^2-4a^3b-4a^2b^2
x^(n-1)-2x^n+x(n-1)