计算(1/3x-y)^2+(1/3x+y)^2

计算x^2y^-3（x^-1y）^3 (2x+y)(x+3y-1)计算 计算3x[xy-2x(1/y-x/3]+3y(x²-y²) 计算:1/(x-y)-1/(x+y)-2y/(x^2+y^2)-4y^3/(x^4+y^4)-8x^7/(x^8+y^8) 计算:(x+3y)(2x-y) 计算:(2x-3y)(x+y) 计算:(-x-2y) * (3x-y) 计算：(x+y)-3(x-2y). 1.计算(a^2+a+1)(a^2-a+1) 2.计算(x-y)(x+y)+(3x-2y)(2x+y)-x(6x-y) 计算:(x-y)(1/9x-y)-(1/3x-y)(1/3x+y) 已知x=2+根号3,y=2-根号3,计算代数式(x+y/x-y-x-y/x+y)乘以(1/x^2-1/y^2) 计算:(x^-1 - y^-1)/(x^-2 - 3x^-1 y^-1 + 2y^-2) 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x 数学用乘法公式计算(x+y+1)(x+y-1)(2x-y-3)² 计算(x+y)(x+y)^2(-x-y)^3 3x(x-y)+2y(x-y) 计算 计算：x+2y/x-y+2x/y-x-3y/x-y 计算：1-2x+x^2/x-x^3*xy+x^2y/x-x^2