(x²-1/x²+6x+9)÷(x-1)·(x+3)(x+4)/x+1
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
x²+3x+9/(x²-27)+6x/(9x-x²)-(x-1)/(6+2x)
4x²-1/3x²-x·9x³-x/2x^4-x³计算 急
x^2-x/x+1÷x/x+1 ;x^2+6x+9/x^2-9÷x+2/x-3;2/a÷4/a
6x+(2x²-3x)-(x²-1)
计算:(3/x)+(x/x²-1)-(4/1-x)
((x²-5x+6)/(12-7x+x²))²÷((x²+3x+2)/(x
(2x-6)/(x²-4x+4)÷(3-x)/(x²+6x+9)×(2-x)/(x+3)
解方程:x(6-x)-2x(x+1)-(x^3-3x^4)/x²=4
y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1
计算:2x/(x-2)(x+1)÷(1-x/x+1)-x²+2x/x²-4?