1.9(a-b)(a+b)-3(a-b)^2 2.-2(b-2a)^2+(b-2a) 3.3(x+y)(y-x)-(x-y)^2 4.-3(x-y)^2-(y-x)^3用提取公因数

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1.9(a-b)(a+b)-3(a-b)^2 2.-2(b-2a)^2+(b-2a) 3.3(x+y)(y-x)-(x-y)^2 4.-3(x-y)^2-(y-x)^3用提取公因数
1.9(a-b)(a+b)-3(a-b)^2 2.-2(b-2a)^2+(b-2a) 3.3(x+y)(y-x)-(x-y)^2 4.-3(x-y)^2-(y-x)^3
用提取公因数

1.9(a-b)(a+b)-3(a-b)^2 2.-2(b-2a)^2+(b-2a) 3.3(x+y)(y-x)-(x-y)^2 4.-3(x-y)^2-(y-x)^3用提取公因数
1.9(a-b)(a+b)-3(a-b)^2
=3(a-b)(3(a+b)-(a-b))
=3(a-b)(2a+4b)
=6(a-b)(a+2b)
2.-2(b-2a)^2+(b-2a)
=(b-2a)(-2(b-2a)+1)
=(b-2a)(-2b+4a+1)
3.3(x+y)(y-x)-(x-y)^2
=(y-x)(3(x+y)-(y-x))
=(y-x)(4x-2y)
=2(y-x)(2x-y)
4.-3(x-y)^2-(y-x)^3
=-(y-x)^2(3+y-x)

9(a-b)(a+b)-3(a-b)^2
=3(a-b)[3(a+b)-(a-b)]
=3(a-b)(2a+4b)
2.-2(b-2a)^2+(b-2a)
=(b-2a)[-(b-2a)+1]
=(b-2a)(2a-b+1)
3.3(x+y)(y-x)-(x-y)^2
=(y-x)[3(x+y)-(y-x)]
=(y-x)(4x+2y)
4.-3(x-y)^2-(y-x)^3
=-3(x-y)^2+(x-y)^3
=(x-y)^2[-3+(x-y)]
=(x-y)^2(x-y-3)

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