(2x-3)(x²+x-1)+(-x+2)·(2x²+1) 化简
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
化简(x+1/x)²+2(x+1/x)+2
6x+(2x²-3x)-(x²-1)
(2x²-2x+3)(-x³+x-1)
4x²-1/3x²-x·9x³-x/2x^4-x³计算 急
化简{x²-2x分之x+2-x²-4x+4x分之x-1}除以X分之(x-1)(X-4)乘以(2-x)
x²+3x+9/(x²-27)+6x/(9x-x²)-(x-1)/(6+2x)
(x+1)/(x²+3x+2)+(x²-2x)/(x²-4)
x(x²-1)+2x²(x+1)-3x(2x-5)计算
(x-1)(2x²-3x+2)-x(x+1)(x-2)
①2(x+3)(x-3)=x²+(x-1)(x+1)+2x
x-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2)