2x-2≤1-x²≤3x²-3x
(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)
(2x²-2x+3)(-x³+x-1)
x²+3x+9/(x²-27)+6x/(9x-x²)-(x-1)/(6+2x)
解关于x的不等式 (x²-3x-10)/(x²+x+2)≤0
(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)
2x-2≤1-x²≤3x²-3x
3x⁷*x⁴+2x*x²*x⁴-4x⁵*(-x)²
计算: (x+3)(x²-x-2)