4X＾2-12XY+9Y＾2-2X+3Y-6化简!

因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) 4X＾2-12XY+9Y＾2-2X+3Y-6化简! 已知X+Y=3,XY=-1,求2(X-Y)^4-9(X-Y)^2+12XY 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)答案应为-2x-x*x-3x， X×X-2XY-Y×Y+2X-2Y+2=02X×2X-4XY-2Y×2Y+3X-3Y+4=0X×X+2XY+Y×Y+X+Y-56=0X×X-2XY+Y×Y-X+Y-12=0X×X-3XY+Y×Y=-13X×3X-XY+3Y×3Y=13 两个在一起的方程之间有所联系（要求一步一步写出来） 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 因式分解2x^2y-x^3-xy^2 4-12(x-y）+9（x-y）^22x^2y-x^3-xy^24-12(x-y）+9（x-y）^2 已知x＾2y等于3,求2xy(x^5y^2-3x^3y-4x) 已知7 x＾2 + 5y x＾2=12xy,并且xy不等于0,则可求出（）的值（1）xy（2）x/y（3）x+y（4）x-y为什么? 化简2(x²y+xy)-3(x²y-xy)-4x²y 3x*x+5xy-2y*y+x+9y-4 3x*x+5xy-2y*y+x+9y-4请因式分解 4x^2y+12xy+9y分解因式 若x+y=4,x^3+y^3=(x+y)(x^2-xy+y^2)z,求x^3+12xy+y^3的值. （-3x^y+2xy)-( )=4x^+xy (x^2y-9y)/(xy+3y)