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 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)

(a+2b)(a-2b)+(a-b)(a+b)-2(a-3b)(a-b) (a+b).(a-b) a/b-b/a a+b>a-b, 5(a*a*b-3*a*a*b)-2*(a*a*b-7*a*b*b) (2a-3b)[(a+b)-b(a-3b)] (2/3a)-[2/(a+b)]{[(a+b)/3a]-a-b}÷[(a-b)/b] a-b>a,a+b (2/3a)-[2/(a+b)]{[(a+b)/3a]-a-b}÷[(a-b)/a] 化简:[2/3a - 2/(a+b) * (a+b/3a - a - b)] / (a-b)/a 计算a+b/b-a-b/b 计算：3a+4b/a-b+3b/b-a-4a/a-b 2(a+3b)²-8(a+b)(a-b)-(a+3b)(a-b) 化简a/b(a-b)-b/a(a-b)其中a=3 b=-2 a^2(a-b)+b^2(b-a) 因式分解 (a-b)^3-(a-b)^2 因式分解 A-B A+B 2B+A 3A-B 6A+2B 2(a+b)-[4(a+b)-3(a+b)]一[5(a-b)+(a-b)]过程 化简【3A方-(A+B)(B-A)】【4(-B-A)(B-A)+5B方】