两道关于二项式的题~1.(X^2+3X+2)^5中,X^4的系数为多少?2.(1-X)^3(1+X+X^2)^5的展开式中X^7的系数是多少?
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![两道关于二项式的题~1.(X^2+3X+2)^5中,X^4的系数为多少?2.(1-X)^3(1+X+X^2)^5的展开式中X^7的系数是多少?](/uploads/image/z/10284095-47-5.jpg?t=%E4%B8%A4%E9%81%93%E5%85%B3%E4%BA%8E%E4%BA%8C%E9%A1%B9%E5%BC%8F%E7%9A%84%E9%A2%98%7E1%EF%BC%8E%EF%BC%88X%EF%BC%BE2%EF%BC%8B3X%EF%BC%8B2%EF%BC%89%EF%BC%BE5%E4%B8%AD%2CX%EF%BC%BE4%E7%9A%84%E7%B3%BB%E6%95%B0%E4%B8%BA%E5%A4%9A%E5%B0%91%3F2%EF%BC%8E%EF%BC%881%EF%BC%8DX%EF%BC%89%EF%BC%BE3%EF%BC%881%EF%BC%8BX%EF%BC%8BX%EF%BC%BE2%EF%BC%89%EF%BC%BE5%E7%9A%84%E5%B1%95%E5%BC%80%E5%BC%8F%E4%B8%ADX%EF%BC%BE7%E7%9A%84%E7%B3%BB%E6%95%B0%E6%98%AF%E5%A4%9A%E5%B0%91%3F)
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