4X(-3)2-5X(-3)-19

x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4 x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x |X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10| x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? 2x+3x+4x+5x+x+6x+7x=100 x+2x-3x-4x+5x+6x-7x.-196x+197x+198x-199x-200x 等于多少 X^4-X^3-5X^2-6X-4 (x-4)(2x-5)-(3x-2)(x+6) 1.2-5x+x*x2.2x*x-5x+13.x*x-3/2*x-24.-x*x-4x+3 已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^5+x^6+x^7+x^8的值 用简便方法计算 （x-2)(x-3)+(x-4)(x-5)+(x-2)(x-4)+(x-3)(x-5) y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1