2a^2(3a^2-2a+1)+4a^3 (-2x^2y+6x^3y^4-8xy)÷(-2xy) (2x+y)^2-(2

(1)1-a/a*a-2a+1 (2)3x-4y/8xy-6x*x (3)2x*xy(x-y)/12xy*y(y-x) 计算（1）x/x+y-x/x-y （2）a+2+4/a+2 （3）x^2-y^2/xy÷(x+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 因式分解：4a^2(x-y)+9(y-x) -4x^2y^2+x^3y+4xy^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|+ 设A=2x-3xy+y+x-3y,B=4x-6xy+2y+4x-y,若|x-3a|+（y+3）=0,且B-2A=a.求A 3a-3b/10ab*25a^b3/a^-b^= x^-4y^/x^+2xy+y^/x+2y/2x^+2xy 若A=2x²-4xy-2y²-2x+2y,B=4x²-6xy+2y²-3x-y. 设A=2X²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若| 设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y 若|