已知(1+x)+(1+x)^2+(1+x)^3+.+(1+x)^n=a0+a1x+a2x^2+.anx^n,若a1+a2+..已知(1+x)+(1+x)^2+(1+x)^3+......+(1+x)^n=a0+a1x+a2x^2+......anx^n,若a1+a2+......+a(n-1)=29-n,求n
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![已知(1+x)+(1+x)^2+(1+x)^3+.+(1+x)^n=a0+a1x+a2x^2+.anx^n,若a1+a2+..已知(1+x)+(1+x)^2+(1+x)^3+......+(1+x)^n=a0+a1x+a2x^2+......anx^n,若a1+a2+......+a(n-1)=29-n,求n](/uploads/image/z/7137480-48-0.jpg?t=%E5%B7%B2%E7%9F%A5%281%2Bx%29%2B%281%2Bx%29%5E2%2B%281%2Bx%29%5E3%2B.%2B%281%2Bx%29%5En%3Da0%2Ba1x%2Ba2x%5E2%2B.anx%5En%2C%E8%8B%A5a1%2Ba2%2B..%E5%B7%B2%E7%9F%A5%281%2Bx%29%2B%281%2Bx%29%5E2%2B%281%2Bx%29%5E3%2B......%2B%281%2Bx%29%5En%3Da0%2Ba1x%2Ba2x%5E2%2B......anx%5En%2C%E8%8B%A5a1%2Ba2%2B......%2Ba%28n-1%29%3D29-n%2C%E6%B1%82n)
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