1 câu trả lời
`#tnvt`
`M=\frac{2}{\sqrt{x}+3}(x>=0)`
`AAx>=0,` ta có: `\sqrt{x}>=0`
`=>\sqrt{x}+3>=3`
`=>\frac{2}{\sqrt{x}+3}<=2/3`
Dấu `=` xảy ra khi `\sqrt{x}+3=3<=>x=0`
Vậy `GTLNN_M=2/3` khi `x=0`
`#tnvt`
`M=\frac{2}{\sqrt{x}+3}(x>=0)`
`AAx>=0,` ta có: `\sqrt{x}>=0`
`=>\sqrt{x}+3>=3`
`=>\frac{2}{\sqrt{x}+3}<=2/3`
Dấu `=` xảy ra khi `\sqrt{x}+3=3<=>x=0`
Vậy `GTLNN_M=2/3` khi `x=0`