高中理科数学题(排列组合)范例:A(2,1)代表从2个里选1个那种形式1、S=A(1,1)+A(2,2)+A(3,3)+.+A(100,100),则S的个位数是?2、设a属于N*,且a<27,将(27-a)(28-a)...(34-a)表示为排列数,其表达形式为?麻烦
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![高中理科数学题(排列组合)范例:A(2,1)代表从2个里选1个那种形式1、S=A(1,1)+A(2,2)+A(3,3)+.+A(100,100),则S的个位数是?2、设a属于N*,且a<27,将(27-a)(28-a)...(34-a)表示为排列数,其表达形式为?麻烦](/uploads/image/z/1761311-47-1.jpg?t=%E9%AB%98%E4%B8%AD%E7%90%86%E7%A7%91%E6%95%B0%E5%AD%A6%E9%A2%98%EF%BC%88%E6%8E%92%E5%88%97%E7%BB%84%E5%90%88%EF%BC%89%E8%8C%83%E4%BE%8B%EF%BC%9AA%282%2C1%29%E4%BB%A3%E8%A1%A8%E4%BB%8E2%E4%B8%AA%E9%87%8C%E9%80%891%E4%B8%AA%E9%82%A3%E7%A7%8D%E5%BD%A2%E5%BC%8F1%E3%80%81S%3DA%281%2C1%29%2BA%282%2C2%29%2BA%283%2C3%29%2B.%2BA%28100%2C100%29%2C%E5%88%99S%E7%9A%84%E4%B8%AA%E4%BD%8D%E6%95%B0%E6%98%AF%3F2%E3%80%81%E8%AE%BEa%E5%B1%9E%E4%BA%8EN%2A%2C%E4%B8%94a%EF%BC%9C27%2C%E5%B0%86%EF%BC%8827-a%EF%BC%89%2828-a%29...%2834-a%29%E8%A1%A8%E7%A4%BA%E4%B8%BA%E6%8E%92%E5%88%97%E6%95%B0%2C%E5%85%B6%E8%A1%A8%E8%BE%BE%E5%BD%A2%E5%BC%8F%E4%B8%BA%3F%E9%BA%BB%E7%83%A6)
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