化简；-3a+2b-(a-3b); 2(2X-3Y)-4(3/4x-2y+1)

(2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y) 几道因式分解..4ab(a+b)^2-6a^2b(a+b)(x+y)^2(x-y)+(x+y)(x-y)^22a(a-3 因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)( 化简题.化简,(a^-3b^4)^2乘(3a^2b)^-2.(x+y)乘x^2/x^2-y^2+y^2/y-x.y-3/ 分解因式1.2a(x-y)-3b(y-x)2.-x^y-2xy+35y3.a^(x-y)-4b^(x-y)若|a+2|+ A.A+(4X+3Y)B.A+(4X+6Y) C.A+2( 已知集合A={（x,y)| (y-3)/ (x-1)=2,x,y∈R},B={（x,y)| 4x+ay=16,x,y∈ (3x-y)(3x+y)+y(x+y);(a+1/2b)(a-1/2b)-(3a-2b)(3a+2b)快点, 1.已知集合A=｛（x,y)|y=2x+1｝,B=｛(x,y)|y=x+3｝,a∈A,b∈B,求a x²（x+y)(y-x)-xy(x+y)(x-y) 已知a+b=4,ab=-2,求多项式3a²b+3 已知A=2x-4y,B=-2x的2次方+6x-3{y-x},求：{1}2A-B{2}3A-B ①[(x+y)^2-(x+y)(x-y)]/2y②（-1/3a^3b^2)^2(-2ab^2)^3/(1/9a^4b^4