((x²-5x+6)/(12-7x+x²))²÷((x²+3x+2)/(x
((x²-5x+6)/(12-7x+x²))²÷((x²+3x+2)/(x
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
(x-2)(x-3)+2(x+6)(x-5)-3(x²-7x+13)化简
1/x²+x+1/x²+3x+2+1/x²+5x+6+1/x²+7x+12,分式
6x+(2x²-3x)-(x²-1)
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)
x(x²-1)+2x²(x+1)-3x(2x-5)计算
(1/x²+x)+(1/x²+3x+2)+(1/x²+5x+6)+(x²+7x+
解方程x²+x-6分之5x+x²-x-12分之2x-5=x²-6x+8分之7x-10
解方程.(5x/x²+x-6)+(2x-5/x²-x-12)=7x-10/x²-6x+8
1/(x²+3x+2)+1/(x²+5x+6)+1/(x²+7x+12)=1/(3x) 解