Toán Lớp 9: Cho Q = x + căn x + 1 / căn x. Tìm x để Q = 3
Giúp mk vs…………
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Toán Lớp 9: Cho Q = x + căn x + 1 / căn x. Tìm x để Q = 3
Giúp mk vs…………
Comments ( 2 )
Để Q=3 thì {x+\sqrt{x}+1}/\sqrt{x}=3
<=>x+\sqrt{x}+1=3\sqrt{x}
<=>x+\sqrt{x}+1-3\sqrt{x}=0
<=>x-2\sqrt{x}+1=0
<=>(\sqrt{x}-1)^2=0
<=>\sqrt{x}-1=0
<=>\sqrt{x}=1
<=>x=1(TM)
Vậy x=1 để Q=3