x²+3x+9/(x²-27)+6x/(9x-x²)-(x-1)/(6+2x)
(2x-6)/(x²-4x+4)÷(3-x)/(x²+6x+9)×(2-x)/(x+3)
分式计算x²+2x/x²-6x+9÷x²-4/x²-3x
x²+2x/x²-6x+9÷x²-4/x²-3x ,
分式计算:x²+2x/x²-6x+9÷x²-4/x²-3x
已知(x-2)(x²-6x-9)=x(x-5)(x-3),求6x的算术平方根
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
2x^6×x³-3x^9+5x²×x^7等于多少
X²-6x+9 x²-9 x+3
6x+(2x²-3x)-(x²-1)
不等式|(x+3)/x|>(x+3)/x,不等式(x²-9)/(x-2)>0
(x-2)(x-3)+2(x+6)(x-5)-3(x²-7x+13)化简