设ƒ(x),g(x)是定义在区间(a,b)内的两个函数,且满足ƒ(x)≤1,g(x)≥1,那么下列选项中在(a,b)内一定有界的函数为()
A.ƒ(x)/[g(x)]
B.g(x)/[ƒ(x)]
C.1/{[ƒ(x)]2-[g(x)]2}
D.1/{[ƒ(x)]2+[g(x)]2}
正确答案D
设ƒ(x),g(x)是定义在区间(a,b)内的两个函数,且满足ƒ(x)≤1,g(x)≥1,那么下列选项中在(a,b)内一定有界的函数为()
A.ƒ(x)/[g(x)]
B.g(x)/[ƒ(x)]
C.1/{[ƒ(x)]2-[g(x)]2}
D.1/{[ƒ(x)]2+[g(x)]2}
正确答案D