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
1234567654321x(1十2十3十4十5十6十7十6十5十4十3十2十1)等于多少?
X.(X十1)x(X十2)x(x十3) =360
2x十8十3x十8十4x十8=?请算出这道题目求士寸佰了⑥
(7一2X十x平方)一(5十3X一2x平方)
2(x十3)=3(0.5x十10)
设(3x一1)^8=a8x^8十a7x^7十…a1x十ao 求(1) a8十a7十…十a1 (2) a8十a6十a4十a
2x的2次方十1-3x十7-3x的2次方十5求同类项
解方程(3x十3)(x十2)=x十14
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十2y一3Z=0,2X十3y十5Z=0求X十y十Z/X一y十Z的值
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?