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下列函数中值域为R+的是

2025-04-07 11:26:26

推荐回答（1个）

回答1：

A y=1/(9-x)≠0

B y=2/（x＋1）³≠0

C y=√(1-2^x)≥0

D y=x²＋x＋1

y=x²＋x＋1=（x+1/2)²+3/4≥3/4

下列函数中值域为R+的是C y=√(1-2^x)≥0 (较适合）

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