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Forrealnumbera let[a]denotethemaximumintegerwh
问题详情
Forrealnumbera,let[a]denotethemaximumintegerwhichdoesnotexceeda.Forexample,[3.1]=3,[-1.5]=-2,[0.7]=0Nowletf(x)=(x+1)/(x-1),then[f(2)]+[f(3)]+…+[f(100)]=______.(英汉小词典realnumber:实数;themaximumintegerwhichdoesnotexceeda:不超过a的最大整数)
参考答案
∵f(x)=x+1x-1,
∴f(2)=2+12-1=3,f(3)=3+13-1=2,
f(4)=4+14-1=53,f(5)=5+15-1=32,…f(100)=100+1100-1=10199,
∴[f(2)]=3,[f(3)]=2,[f(4)]=[f(5)]=…[f(100)]=1,
∴[f(2)]+[f(3)]+…+[f(100)],
=3+2+1+…+1,
=5+1×97,
=102.
故答案为:102.