计算:6/y-3+2y/3-y

计算:6/y-3+2y/3-y 计算：[(y+1)/(y^2-4y+3)减去(y-2)/(y^2-6y+9)]除以(y-5)/(y-1) 计算（3y-1)(2y+3)-(6y-5)(y-4) 计算：(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2 计算(x-y)^7÷(y-x)^6+9-x-y)^3÷(x+y)^2 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). (y-3)的平方-2(y+2)(y-2)计算、 计算:y×(y/x)^3÷[-(x^2)/y]^-2 计算：y(x-y)^2+(y-x)^3=? 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 y (3y^2+8y-3)-6y(3y+2y-1)+9y 计算；2y-3分之6y-2 (y^2)^4y-(-2y)^3y^6=