求數學高手進..

2008-11-02 9:48 am
這是二項式定理..
find the constant term in the expansion of (1-2x)^9(1+1/x)^3
ans係-293..
我唔知點解次次都係計到-5..
求數學高手將個步驟打出黎..
thx~~~

回答 (1)

2008-11-02 10:03 am
參考: Myself


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