(-3/2xy)^-3÷（5/2x²y³)^-2

先化简,再求值:{xy(x²-3y)+3xy²}(-2xy)+x³y²(2x-y -3(xy-2x²)-[y²-(5xy-4x²)+2xy] [-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y- 计算:x²y-（2xy²-5x²y）+3xy²-y³ -2y³+（3xy²-x²y）-2（xy²-y³） x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2 x²-2xy+y²分之x²+2xy-3y³如何因式分解 计算：（-7x²y）（2x²y-3xy³+xy） 化简（3X²-XY+Y²）-5(X²-XY+2Y²） 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y) 5x^2y/-1/2xy*3xy^2