1/3x(-x²+2x-1)-1/3x²(2x-6x²)
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
6x+(2x²-3x)-(x²-1)
x²+3x+9/(x²-27)+6x/(9x-x²)-(x-1)/(6+2x)
(2x²-2x+3)(-x³+x-1)
((x²-5x+6)/(12-7x+x²))²÷((x²+3x+2)/(x
x除x²+3x+2,-x除x²+2x+1与-1除3x+6
解方程:x(6-x)-2x(x+1)-(x^3-3x^4)/x²=4
(x+1)/(x²+3x+2)+(x²-2x)/(x²-4)
x(x²-1)+2x²(x+1)-3x(2x-5)计算
①2(x+3)(x-3)=x²+(x-1)(x+1)+2x
(x-1)(2x²-3x+2)-x(x+1)(x-2)
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|