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二項式係數是指Cnr,而展開式中的係數是Cnr與X係數的積. 例如:C51(2X)(5下麵1上面,可以理解吧), 它的二項式係數是C51,而展開式係數係數是C51×2=10. 我正在上高三,在總複習,這裡還沒複習到,回答得不够完善,但大概意思再那.
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