1.3a(5a-2b) 2.(x-3y)(-6x) 3.化简x(x-1)+2x(x+1)-1.3a(5a-2b) 2.(x-3y)(-6x)3.化简x(x-1)+2x(x+1)-3x(2x-5).

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1.3a(5a-2b) 2.(x-3y)(-6x) 3.化简x(x-1)+2x(x+1)-1.3a(5a-2b) 2.(x-3y)(-6x)3.化简x(x-1)+2x(x+1)-3x(2x-5).
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1.3a(5a-2b) 2.(x-3y)(-6x) 3.化简x(x-1)+2x(x+1)-1.3a(5a-2b) 2.(x-3y)(-6x)3.化简x(x-1)+2x(x+1)-3x(2x-5).
1.3a(5a-2b) 2.(x-3y)(-6x) 3.化简x(x-1)+2x(x+1)-
1.3a(5a-2b) 2.(x-3y)(-6x)
3.化简x(x-1)+2x(x+1)-3x(2x-5).

1.3a(5a-2b) 2.(x-3y)(-6x) 3.化简x(x-1)+2x(x+1)-1.3a(5a-2b) 2.(x-3y)(-6x)3.化简x(x-1)+2x(x+1)-3x(2x-5).
15a²-6ab

1、15a^2-6ab
2、-6x^2+18xy
3、x^2-x+2x^2+2x-6x^2+15x
=-3x^2+16x

合并同类项 求下列各式的值 1.3a+b-(b-a)^2+a-5b+2(a-b)^2,其中a-b=-22.2(x+y)-2/3(x-y)+1/4(x+y)+2/3(x-y)+2/3(x-y),其中x=-1/2,y=-3/2. 因式分解:(1)、(2a-3b)(7x+y)+(x-5y)(3b-2a)(2)、(x+y)^3(x+y)^2-(-x-y) (2a+b)(2a-3b)+3a(2a+b)和x(x+y)(x-y)-x(x+y)²4a(x+y)-6x-6y和啊a(a-b)-ab+b² 3x(a-b)+2y(b-a) x+y-(2x-y)(x+y)=?12(a^2-b^2)^2-3(a^2+b^2)(a+b)^2等于多少(2a-b)(2a+3b)+3a(b-2a)=-(2a-b)( ),a(x-3)(5-x)+b(3-x)(x-5)=( )(x-3)(a+b)代数式15x^3y^3(x-y),6x^2y^2(y-x),-120x^3y^3(x-y)(x+y)的公因式是?a-b+k(b-a)=( )(k-1)a(b-c)+c-b=(b-c) (x+y)²+2(y-x) 因式分解 怎么弄 我这还有几道题(x+y)²-(x+y)(x-z)+(x+y)(y+z)X(X-a)(x-b)-y(a-x)(b-x)x(x+y)(x-y)-x(x+y)²(2a+b)(2a-3b)-3b(2a+b)(a+b)²-9(a-b)²(a²+b²)²-a²b²9(x-y)-y& 已知A=4x^2-4xy+y^2,B=x^2+xy-5y^2.求:(1)A-3B(2)3A+B (1)(x+y)^2-(x+y)^3(2)(x-y)-(x-y)^3(3)(x-y)^2-(y-x)^3(4)2(x-y)-3(y-x)^2(5)4ab(a=b)^2-6a^2b(a+b)(6)(x+y)^2(x-y)+(x+y)(x-y)^2(7)2a(a-3)^2-6a^2(3-a)+8a(a-3)(8)24xy^2z^2(x+y-z)-32xyz(z-x-y)^2+8xy(z-x-y)(9)(a-b)(b-a)^n(b-a)^2n-1 [两解)(10)2^2=3,2^b (x+y)^2+2x+2y,(a-b)^3-2b(b-a)^2. 1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [(x+y)(x-y)-(x-y)^2+2y(x-y)]÷4y 3)整式乘除 3)(a+b)^2-2a(b+1)-a^2b÷ab 4)(a^2+3)(a-3)-a(a^2-2a-2) 计算 1.[(a+b)^2-(a+b)(a-b)]÷(-b) 2.[(x+y)(2x+y)+(x+y)(x-y)]÷3x 1,(x+y)²-(x+y),2,(x-y)²-(x-y)³2,(x-y)²-(y-x)³ 用分解公因式算(1).2(x-y)-3(y-x)²(2).4ad(a+b)²-6a²b(a+b)(3).(x+y)²(x-y)+(x+y)(x-y)²(4).2a(a-3)²-6a²(3-a)+8a(a-3)(5)2 1.设A={ x | x≥0 },B={ x | x≤0 },求A∩B和A∪B 2.设A={(x,y)| y=-4x+6},B={(x,y)| y=5x-3}求A∩B3.设A={x | x=2k-1,k∈Z},B={x | x=2k,k∈Z},求A∩B,A∪B 1.x(x-y)^2(a-b)-(y-x)^3(b-a) 2.(-2)^2001+2^2002 2.化简(1)(2x-y+z-2c+m)(m+y-2x-2c-z)(2)(a+3b)(a^2-3ab+9b^2)-(a-3b)(a^2+3ab+9b^2)(3)(x+y)^2(y+z-x)+(x-y)^2(x+y+z)(x+y-z)卷子明天就交,救命.我只有5分, 初一数学——因式分解1.(2a-5)(a-2)=___. 2.下列分解因式正确的是() A.a^2-2b^2=(a+2b)(a-2b) B.-x^2+y^2=(-x+y)(-x-y) C.-a^2+9b^2=(-a-3b)(a-3b) D.4x^2-y^2=(-2x-y)(2x+y) 3.下列由左边到右边的变形,属于分解因式的变形 (1)x-y/x-2y÷x^2-y^2/x^2-4xy+4y^2(2)3a/a+b - 3b/a+b(3)x+3/x^2-9 + 3/x-3(4)x^2/x+y - x+y(5)(a^2/a-3 + 9/3-a)÷a+3/a 1.(a-2+b)(a+2+b)2.(x^5y^3-2x^y^2+3/4x^2y^2)/1/12x^2y^2