（x-1)-(x-1)^2+(x-1)^3-(x-1)^4+(x-1)^5展开式中,求x^2的系数
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（x-1)-(x-1)^2+(x-1)^3-(x-1)^4+(x-1)^5展开式中,求x^2的系数（x-1)-(x-1)^2+(x-1)^3-(x-1)^4+(x-1)^5展开式中,求x^2的系数（x
（x-1)-(x-1)^2+(x-1)^3-(x-1)^4+(x-1)^5展开式中,求x^2的系数
（x-1)-(x-1)^2+(x-1)^3-(x-1)^4+(x-1)^5展开式中,求x^2的系数
（x-1)-(x-1)^2+(x-1)^3-(x-1)^4+(x-1)^5展开式中,求x^2的系数
-1+C32(-1)-C42+C52(-1)³
=-1-3-6-10
=-20
(x-1)-(x-1)^2+(x-1)^3-(x-1)^4+(x-5)^5的展开式中x^2的系数
-1-3-6-1250=-1260
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分解因式----（X*X-X)(X*X-X-2)+1
】x(x+1)+x^2(x-1)
1/(1-x)+1/(1+x)+2/(1+x*x)+4/(1+x*x*x*x)+8/(1-x*x*x*x*x*x*x*x)怎么做
x/x+(1-x)/x-1/x
x-1/x-2
{2X+1}+{X}
(x^2-1)/x
x^2-1/x
2X+|X+1|
｜x-1｜+｜x-2｜
(x+1)/(x+2)
/X+1/+/X+2/
2x/(1-x)
|X+2|+|X-1|
2x-1 (x