计算：3x^3×(-1/9x^2)

计算 2+x+3/x-1*x^2-2x+1/x^2+6x+9 计算：[x/(x^-3x)](x^2-9) 计算(x+1)(x+2)(x+3)(x+4) 计算：（x+1)(x-2)(x-3)(x-6) 计算 x(x+3)-(x-1)(x-2） 如何计算 (x+1)(x+2)(x+3)(x+4) 计算(X-1)(X-2)(X-3)(X-4) (x-1)(x-2)(x-3)(x-4)-24计算 计算：(1)/(x-3)÷(x+2)/(x^2-9)-(1)/(x^2+5x+6) 计算1/x-3 - 6/x*x-9 - x-1/6-2x 计算:1/(x+1) * [(x-3)/(x^2 + 6x + 9) + 2/(3+x)] - x/(x^2 - 9) (x+1/x+3)²÷x²-1/x²-9·(x-2)(x+1)/x-3计算 计算：(x+1)x=7 (x-1)(x+2)=30 (3-x)(3-x)+x=9 4x²-1/3x²-x·9x³-x/2x^4-x³计算 急 计算：x/(x-1)-(x+3)/(x^-1)*(x^2+2x+1)/(x+3) 计算:[(x^2 - 4)/(x^2 - x - 6) + (x+2)/(x-3)] / (x+1)/(x-3) 计算：1-2x+x^2/x-x^3*xy+x^2y/x-x^2 计算3/x-2+2/1-x