x十4·x+2

x十4·x+2 已知1十x十x^2 十x^3=0,求x十x^2十x^3十x^4+x^5十x^6+x^7十x^8的值 2x十8十3x十8十4x十8=?请算出这道题目求士寸佰了⑥ 2(3X十2)二4(X十4) 己知/x十2/十/y十4/求x十y x^2十2x十1=4 2(x-7)=x十4 (x+4)(x-4)-(x-2)(x十8 已知f（x）=2X十|,X≥O;X^2十4,x 一(x2十3X)十2(4X十x2),其中X=一2 解方程(1/x十1)十(1/x十4)二(1/x十2)十(1/x十3) 1/(x^2一4x十3)十1/(x^2一8x十15)十1/(x^2-12x十35)十1/(x^2一16x十63)= (x十3)(x十4)一x(x+2)一5 2（|X十2|）二|X十2|十4 分解因式:×4十2x3十3X2十2x十1 x十y+z二2,4x十2y十z二6 一2(2X平方一X十4)十3(x平方一2x十3) X.(X十1)x(X十2)x(x十3) =360