初一因式分解,快啊!

9a²-36=(3a)²-6²=(3a+6)(3a-6)

100a^4-0.81a²=(10a²)²-(0.9a)²=(10a²+0.9a)(10a²-0.9a) =a(10a+0.9)(10a-0.9)

(7a+8b)²-4x²=(7a+8b+2x)(7a+8b-2x)

x²(x-4)+y²(4-x)=x²(x-4)-y²(x-4)=(x²-y²)(x-4)=(x+y)(x-y)(x-4)

(x²-y²)²-x²y²=(x²-y²+xy)(x²-y²-xy)

(a+b)²-(a-2b)²=(a+2b+a-2b)(a+b-a+2b)=6ab

16(x-y)²-25(x+y)²=(4(x-y))²-(5(x+y))²=(4x-4y+5x+5y)(4x-4y-5x-5y)=(9x-y)(-x-9y)=(y-9x)(x+9y)

(2m-n)²-(3m+2n)²=(2m-n+3m+2n)(2m-n-3m-2n)=(5m+n)(-m-3n)=-(5m+)(m+3n)

9a²-36 =(3a+6)(3a-6)
100a^4-0.81a² =(10a^2+0.9a)(10a^2-0.9a)

-(25/121n)^3+64n =(8n+5/11m)(8n-5/11m)

(7a+8b)²-4x² =(7a+8b+2x) (7a+8b-2x)
x²(x-4)+y²(4-x) =(x-4)(x+y)(x-y)
(x²-y²)²-x²y² =(x²-y²-xy) (x&su