((1-2x)^5)*(1+2x+4x^2)^4的展开式中x^7的系数及各项的系数和只要说大概的思路即可..这样啊
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![((1-2x)^5)*(1+2x+4x^2)^4的展开式中x^7的系数及各项的系数和只要说大概的思路即可..这样啊](/uploads/image/z/7035780-12-0.jpg?t=%EF%BC%88%281-2x%29%5E5%EF%BC%89%2A%281%2B2x%2B4x%5E2%29%5E4%E7%9A%84%E5%B1%95%E5%BC%80%E5%BC%8F%E4%B8%ADx%5E7%E7%9A%84%E7%B3%BB%E6%95%B0%E5%8F%8A%E5%90%84%E9%A1%B9%E7%9A%84%E7%B3%BB%E6%95%B0%E5%92%8C%E5%8F%AA%E8%A6%81%E8%AF%B4%E5%A4%A7%E6%A6%82%E7%9A%84%E6%80%9D%E8%B7%AF%E5%8D%B3%E5%8F%AF..%E8%BF%99%E6%A0%B7%E5%95%8A)
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