化简.快-8x^3y/12xy^27(a-b)^3/14(b-a)^2x-x^2/x^2-2x+1

3y/2x+2y＋2xy/x²+xy 2x/x²-64y²－1/x-8y (1/a+1/b 已知：A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B 已知:6x²-7xy-3y²+14x+y+a=(2x-3y+b)(3x+y+1)求a,b的值 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|+ 3a-3b/10ab*25a^b3/a^-b^= x^-4y^/x^+2xy+y^/x+2y/2x^+2xy 已知代数式A=2x^2+3xy+2y-1,B=x^2-xy+x-1/2 已知代数式A=2x^3+3xy+2y-1,B=x^2-xy+x-1/2 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=2x²+3xy-2x-1,B=-x²+xy-1,3A+6B的值与x无关,求y A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x= 设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若x 设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y.若x