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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 9: Tìm x để M đạt GTNN M=2/ √x +3

Toán Lớp 9: Tìm x để M đạt GTNN
M=2/ √x +3

Comments ( 1 )

  1. #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
     

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222-9+11+12:2*14+14 = ? ( )