(x^2十6x)^2+18(x^2+6x)+81求过程

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 6x^2十x一2 (x^3十3x^2-5x十6)-(2x^2-5x十1)-(x^3十x^2-2) (2x三次方一x十6)x(3x2十5x一2) (x^2十6x)^2+18(x^2+6x)+81求过程 X.(X十1)x(X十2)x(x十3) =360 x^2(x十3)十x(x^2一3)十3x(x^2+x一1) 用不用化到x(5x^2十6x一6) 数学题 5x十2x=42 15十2x一3=48 2x十3x十17=37 6x一3x=6÷5 9x一2x=15x十2x=4215十2x一3=482x十3x十17=376x一3x=6÷59x一2x=1.4十0.077(2x一6)=15.4 27046=2x多少十7x多少十4x多少十6x多少 解方程；多项式乘多项式这一章；(x一1)(x十6)=(x十2)(x十4) (一x十2x的平方十5)十(4x的平方一3一6x) 6x一4≤3 2一X≤X十3 3X一2>X十8 2x十5=17,8x-3x=6.5,6x十3x=36, *-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || 计算:6x2一(2x一1)(3x一2)十(x十2)(x一2)一x(x十7)这题怎么做? x(x*x-6x-9)-x(x*x-8x-15)+2x(3-x) 已知x乘x十2x-1=0,求3x乘x十6x十2007的值 2(x十2)