3x/1-9x² = 1/2 - x/6x-2

4个回答

（1）2x/9-x² + 1/x-3 + 2/x²+6x+9
(x^2+3x+9)/(x^2-9)+6x/(9x-x^2)-(x-1)/(6+2x)
计算:1/(x+1) * [(x-3)/(x^2 + 6x + 9) + 2/(3+x)] - x/(x^2 - 9)
(1-x/3-x)^2÷(x^2-6x+9/9-x^2)*1/x^2-2x+1
(x2+3x+9)/(x2-27)+(6x)/(9x-x2)-(x-1)/(6+2x)
计算：(1/x-3)+(1-x/6+2x)-(6/x^2-9)
(X^3-1)/(X-1)= （9x^3-6X^2-5X+2)/(3X-1)=
9x+6x²-3(x-2/3x²）其中x=-1 (2)1/2(2x-6x-4)-4(-1+x+1/4
化简(9x^2-6x+1)*3x+1/9x^2-1
1/x(x+3)+1/(x+3)(x+6)+1/(x+6)(x+9)=3/2x+18