计算:5x-2y-6+ (1/x) + (1/y)
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:(2/3x√9x+6x√y/x)+(y√x/y-√1/x)
利用因式分解计算1/2x(x-y)^2-1/5y(x-y)
计算:1/2x-1/x+y×(x+y/2x-x-y)
计算:1/(2x) - 1/(x+y)((x+y)/(2x) - x - y)
计算(4x^2-2x^3+6x)/(-2x)-(x-1)^2y^2-4/y^2-y-6)+(y+2/y-3)/(y+1/
计算:(x-y)^2*(y-x)^2*(x-y)^6
是关于因式分解的``1.计算x×x×x×x+5×x×x-6(x+y)(x+y+2xy)+(xy+1)(xy-1)2.已知
(2x+y)(x+3y-1)计算
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
谁帮我计算下面几道题?二元一次方程 2x-6+y=7 2x+y=1 x+2y=5 x-2y=7 2x-3y=5 x=y=
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