二项式定理题:求(1+x)^2n+x(1+x)^(2n-1)+x^2(1+x)^(2n-2)+……+x^n(1+)^n展开式中,x^n的系数求(1+x)^2n+x(1+x)^(2n-1)+x^2(1+x)^(2n-2)+……+x^n(1+)^n展开式中,x^n的系数 (2n+1)!/(n+1)!即 C 上标(n+1) 下标(2n+1) 灌水充数的!
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![二项式定理题:求(1+x)^2n+x(1+x)^(2n-1)+x^2(1+x)^(2n-2)+……+x^n(1+)^n展开式中,x^n的系数求(1+x)^2n+x(1+x)^(2n-1)+x^2(1+x)^(2n-2)+……+x^n(1+)^n展开式中,x^n的系数 (2n+1)!/(n+1)!即 C 上标(n+1) 下标(2n+1) 灌水充数的!](/uploads/image/z/976740-60-0.jpg?t=%E4%BA%8C%E9%A1%B9%E5%BC%8F%E5%AE%9A%E7%90%86%E9%A2%98%EF%BC%9A%E6%B1%82%281%2Bx%29%5E2n%2Bx%281%2Bx%29%5E%282n-1%29%2Bx%5E2%281%2Bx%29%5E%282n-2%29%2B%E2%80%A6%E2%80%A6%2Bx%5En%281%2B%29%5En%E5%B1%95%E5%BC%80%E5%BC%8F%E4%B8%AD%2Cx%5En%E7%9A%84%E7%B3%BB%E6%95%B0%E6%B1%82%281%2Bx%29%5E2n%2Bx%281%2Bx%29%5E%282n-1%29%2Bx%5E2%281%2Bx%29%5E%282n-2%29%2B%E2%80%A6%E2%80%A6%2Bx%5En%281%2B%29%5En%E5%B1%95%E5%BC%80%E5%BC%8F%E4%B8%AD%2Cx%5En%E7%9A%84%E7%B3%BB%E6%95%B0+%282n%2B1%29%21%2F%28n%2B1%29%21%E5%8D%B3+C+%E4%B8%8A%E6%A0%87%28n%2B1%29+%E4%B8%8B%E6%A0%87%282n%2B1%29+%E7%81%8C%E6%B0%B4%E5%85%85%E6%95%B0%E7%9A%84%21)
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