计算:(-4x^3y^3+3x^3y^2+6x^2y^2)÷(-2xy)^2
计算4xy+(x-2y)的平方+(x+3y)(3y-x)
计算:3xy[2xy-x(y-2)+x]
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)
计算3x/8y×16y²/27x² (2xy-x²)÷x-2y/xy 2x-6/x
计算(1)x/x+y-x/x-y (2)a+2+4/a+2 (3)x^2-y^2/xy÷(x+y)
计算(3x^3y-x^2y+1/2xy)÷(-1/2xy)
计算:(x^2-y^2/xy)^2/(x+y)^2*(x/x-y)^3
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
计算3xy[2xy-x(y-2)+x-1]
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)