计算:2x^2·(-x)^2-x·(-x)^3+(-3x^2)·x^2
计算(x+4)·(-2x)-(x+1)(x-1)+(-3x+2)(x+1); (3x-y)(y+3x)-(4x-3x)(
x/x-3-5x/x^2-x-6计算
3x³·x^9+x²·x^10-2x·x³·x^8计算
4x²-1/3x²-x·9x³-x/2x^4-x³计算 急
(3x^2-2x+1)·3x计算
计算 3x·(x²+x+2)
计算: (x+3)(x²-x-2)
计算 (x+3)(x²-x-2)
计算:﹙﹣x﹚^4·x^3-x^7-2x^3·(-x)^4 计算:(2x-1)^2-2(x-2)(x+6)
计算:2x^2·(-x)^2-x·(-x)^3+(-3x^2)·x^2
计算[(3X/(X-2))-(X/(X+2))]·((X²-4)/X)
计算:(x+2)/(x^2 - x - 6) + 2x/(x^2 - 3x) - x/(x^2 - 6x + 9)