f(x)= x+3(x>10),f[f(x=5)](x≤10) 则f(5)的值为——
问题描述:
f(x)= x+3(x>10),f[f(x=5)](x≤10) 则f(5)的值为——
f(x)= x+3(x>10),
f[f(x=5)](x≤10)
则f(5)的值为——24
答
题目应该是印错了,正确的应该是这样的(根据答案推测)f(x)= x+3(x>10),f[f(x+5)](x≤10) f(x)=f(f(x+5))=>f(5)=f(f(10))因为10f(10)=f(f(15)))因为15>10,=>f(15)=x+3=18=>f(f(15)))=f(18)=21=>f(f(10))=f(21)=24=>...