f(x)=5(x≤1) f(x)=1/x-1(x﹥1) f(5)= f(1/2)=f(x)=5(x≤1)f(x)=1/x-1(x﹥1)f(5)=f(1/2)=

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f(x)=5(x≤1) f(x)=1/x-1(x﹥1) f(5)= f(1/2)=f(x)=5(x≤1)f(x)=1/x-1(x﹥1)f(5)=f(1/2)=

f(x)=5(x≤1) f(x)=1/x-1(x﹥1) f(5)= f(1/2)=f(x)=5(x≤1)f(x)=1/x-1(x﹥1)f(5)=f(1/2)=
f(x)=5(x≤1) f(x)=1/x-1(x﹥1) f(5)= f(1/2)=
f(x)=5(x≤1)f(x)=1/x-1(x﹥1)f(5)=f(1/2)=

f(x)=5(x≤1) f(x)=1/x-1(x﹥1) f(5)= f(1/2)=f(x)=5(x≤1)f(x)=1/x-1(x﹥1)f(5)=f(1/2)=
∵5>1
使用第二个解析式
∴f(5)=1/(5-1)=1/4
∵1/2