求(1+1/x)(x+1)^4展开式中x^2项的系数还有题圆锥体底面半径r=3,沿圆锥体的母线把侧面展开后得到圆心角2π/3,求圆锥体体积
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![求(1+1/x)(x+1)^4展开式中x^2项的系数还有题圆锥体底面半径r=3,沿圆锥体的母线把侧面展开后得到圆心角2π/3,求圆锥体体积](/uploads/image/z/10261964-20-4.jpg?t=%E6%B1%82%EF%BC%881%2B1%2Fx%29%EF%BC%88x%2B1%EF%BC%89%5E4%E5%B1%95%E5%BC%80%E5%BC%8F%E4%B8%ADx%5E2%E9%A1%B9%E7%9A%84%E7%B3%BB%E6%95%B0%E8%BF%98%E6%9C%89%E9%A2%98%E5%9C%86%E9%94%A5%E4%BD%93%E5%BA%95%E9%9D%A2%E5%8D%8A%E5%BE%84r%3D3%2C%E6%B2%BF%E5%9C%86%E9%94%A5%E4%BD%93%E7%9A%84%E6%AF%8D%E7%BA%BF%E6%8A%8A%E4%BE%A7%E9%9D%A2%E5%B1%95%E5%BC%80%E5%90%8E%E5%BE%97%E5%88%B0%E5%9C%86%E5%BF%83%E8%A7%922%CF%80%2F3%2C%E6%B1%82%E5%9C%86%E9%94%A5%E4%BD%93%E4%BD%93%E7%A7%AF)
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