x²-x-6 =(x-3)(x+2)
(a+2)²-a-2=(a+2)(a+2-1)=(a+2)(a+1)
9(3a+2b)²-25(a-2b)=(9a+6b+5a-10b)(9a+6b-5a+10b)=(14a-4b)(4a+14b)=4(7a-2b)(2a+7b)
x^4-8x²y²+16y^4=(x²-4y²)²=(x-2y)²(x+2y)²
8x³y-8x²y²+2xy³=2xy(4x²-4xy+y²)=2xy(2x-y)²
(x+y)²-4a+4 这个题目错了
4(2m+n)²-16(m-2n)²=(4m+2n-4m+8n)(4m+2n+4m-8n)=16n(8m-6n)=32n(4m-3n)
(x-6)(x+2)(x-y)²
(x-y)²(x+y)²这两个题目不用分解了