x·(9x^3y-3xy^2)÷(-3x^2y) [(x+y)^2-(x-y)^2]÷(-4xy) 怎么写x·(9x^3y-3xy^2)÷(-3x^2y)[(x+y)^2-(x-y)^2]÷(-4xy)

化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) 【x(xy-xy)-y(x-xy)】÷3xy (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)答案应为-2x-x*x-3x， (3xy)^2÷(-xy)+(x-2y)^2-(x+2y)(x-2y) -x-3xy+y 几道数学题：x-x^2分之x^2-1×1-y分之xy-x,（xy-x^2）÷xy分之x-y,x^2+x分之x-3÷（x^2-6x+9）谢谢! x·(9x^3y-3xy^2)÷(-3x^2y) [(x+y)^2-(x-y)^2]÷(-4xy) 怎么写x·(9x^3y-3xy^2)÷(-3x^2y)[(x+y)^2-(x-y)^2]÷(-4xy) x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² 因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) x^2y-x^3/x^2+2xy+y^2÷x/x-y乘以x+y/x^2-2xy+y^2 ①(x²-6x+6)/(x²-1)▪(x²+x)/(x-3)②（xy-x²）÷(x-y)/xy③[(x²-y²)/y]²÷(x²+xy)³▪[xy/(y-x)]²④[(x²+2x-3)/(9-x²)]³▪[-(x-3)/(1-x)]² -xy^2(x+y)^3+x(x+y)^2因式分解 (x+3y)/(x^2+xy)-x+y计算题 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 [(3x+y)虏-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy) 是[(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy) x·（9x³y-3xy²)÷（﹣3x²y) 计算 若xy=2（x+y),求 （3x-5xy+3y)÷(-x+3xy-y) 的值 已知Y-x=3xy,求(5x+3xy-5y)÷(x-2xy-y)