Tìm giá trị lớn nhất của biểu thức

Tìm GTLN của biểu thức: <!--[if gte msEquation 12]> mso-hansi-font-family:"Cambria Math";font-style:italic;mso-bidi-font-style:
normal'> "Cambria Math";mso-hansi-font-family:"Cambria Math";font-style:italic; mso-bidi-font-style:normal'> line-height:115%;font-family:"Cambria Math","serif";mso-fareast-font-family:
"Malgun Gothic";mso-fareast-theme-font:minor-fareast;mso-bidi-font-family:
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mso-fareast-language:KO;mso-bidi-language:AR-SA'>x line-height:115%;font-family:"Cambria Math","serif";mso-fareast-font-family:
"Malgun Gothic";mso-fareast-theme-font:minor-fareast;mso-bidi-font-family:
"Times New Roman";mso-bidi-theme-font:minor-bidi;mso-ansi-language:VI;
mso-fareast-language:KO;mso-bidi-language:AR-SA'>+2 line-height:115%;font-family:"Cambria Math","serif";mso-fareast-font-family:
"Malgun Gothic";mso-fareast-theme-font:minor-fareast;mso-bidi-font-family:
"Times New Roman";mso-bidi-theme-font:minor-bidi;mso-ansi-language:VI;
mso-fareast-language:KO;mso-bidi-language:AR-SA'>x+ "Cambria Math";mso-hansi-font-family:"Cambria Math";font-style:italic; mso-bidi-font-style:normal'> line-height:115%;font-family:"Cambria Math","serif";mso-fareast-font-family:
"Malgun Gothic";mso-fareast-theme-font:minor-fareast;mso-bidi-font-family:
"Times New Roman";mso-bidi-theme-font:minor-bidi;mso-ansi-language:VI;
mso-fareast-language:KO;mso-bidi-language:AR-SA'>x line-height:115%;font-family:"Cambria Math","serif";mso-fareast-font-family:
"Malgun Gothic";mso-fareast-theme-font:minor-fareast;mso-bidi-font-family:
"Times New Roman";mso-bidi-theme-font:minor-bidi;mso-ansi-language:VI;
mso-fareast-language:KO;mso-bidi-language:AR-SA'>+1<!--[endif]--><!--[if gte vml 1]--> id="_x0000_t75" coordsize="21600,21600" o:spt="75" o:preferrelative="t"
path="m@4@5l@4@11@9@11@9@5xe" filled="f" stroked="f">

















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o:title="" chromakey="white"/>
<!--[endif]--><!--[if gte msEquation 12]--> mso-hansi-font-family:"Cambria Math";font-style:italic;mso-bidi-font-style:
normal'> "Cambria Math";mso-hansi-font-family:"Cambria Math";font-style:italic; mso-bidi-font-style:normal'> line-height:115%;font-family:"Cambria Math","serif";mso-fareast-font-family:
"Malgun Gothic";mso-fareast-theme-font:minor-fareast;mso-bidi-font-family:
"Times New Roman";mso-bidi-theme-font:minor-bidi;mso-ansi-language:VI;
mso-fareast-language:KO;mso-bidi-language:AR-SA'>x line-height:115%;font-family:"Cambria Math","serif";mso-fareast-font-family:
"Malgun Gothic";mso-fareast-theme-font:minor-fareast;mso-bidi-font-family:
"Times New Roman";mso-bidi-theme-font:minor-bidi;mso-ansi-language:VI;
mso-fareast-language:KO;mso-bidi-language:AR-SA'>+2 line-height:115%;font-family:"Cambria Math","serif";mso-fareast-font-family:
"Malgun Gothic";mso-fareast-theme-font:minor-fareast;mso-bidi-font-family:
"Times New Roman";mso-bidi-theme-font:minor-bidi;mso-ansi-language:VI;
mso-fareast-language:KO;mso-bidi-language:AR-SA'>x+ "Cambria Math";mso-hansi-font-family:"Cambria Math";font-style:italic; mso-bidi-font-style:normal'> line-height:115%;font-family:"Cambria Math","serif";mso-fareast-font-family:
"Malgun Gothic";mso-fareast-theme-font:minor-fareast;mso-bidi-font-family:
"Times New Roman";mso-bidi-theme-font:minor-bidi;mso-ansi-language:VI;
mso-fareast-language:KO;mso-bidi-language:AR-SA'>x line-height:115%;font-family:"Cambria Math","serif";mso-fareast-font-family:
"Malgun Gothic";mso-fareast-theme-font:minor-fareast;mso-bidi-font-family:
"Times New Roman";mso-bidi-theme-font:minor-bidi;mso-ansi-language:VI;
mso-fareast-language:KO;mso-bidi-language:AR-SA'>+1<!--[endif]--><!--[if gte vml 1]--> id="_x0000_t75" coordsize="21600,21600" o:spt="75" o:preferrelative="t"
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<!--[endif]-->E =
√x+2
x+√x+1