几个关于，数学的题！！！

分解因式
1.(a-b)2次(3a+b)+3(b-a)3次
=(b-a)^2[3a+b+3(b-a)]
=(b-a)^2(4b)
=4b(b-a)^2

2.4（x+2y)2次-25(x-y)2次

=[2(x+2y)+5(x-y)][2(x+2y)-5(x-y)]
=(7x-y)(9y-3x)
=3(7x-y)(3y-x)

1.解方程：（55x+35)(53x+26)-（55x+35)(55x+27)=0
(55x+35)(53x+26-55x-27)=0
(55x+35)(-2x-1)=0

x1=-7/11
x2=-1/2

x3次-9x=0

x(x+3)(x-3)=0

x1=0
x2=3
x3=-3