1/x+1-x+3/x²-1×x²-2x+1/x²+4x+3
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
(x+1)/(x²+3x+2)+(x²-2x)/(x²-4)
6x+(2x²-3x)-(x²-1)
计算:(3/x)+(x/x²-1)-(4/1-x)
(2x²-2x+3)(-x³+x-1)
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
x²+3x+9/(x²-27)+6x/(9x-x²)-(x-1)/(6+2x)
x(x²-1)+2x²(x+1)-3x(2x-5)计算
4x²-1/3x²-x·9x³-x/2x^4-x³计算 急
①2(x+3)(x-3)=x²+(x-1)(x+1)+2x
解方程:x(6-x)-2x(x+1)-(x^3-3x^4)/x²=4