Xét bt:
A = $\frac{a^{2}+\sqrt{a}}{a-\sqrt{a}+1}$ $-$ $\frac{2a+\sqrt{a}}{\sqrt{a}}$ + 1
Tìm min của A
Xét bt: A = $\frac{a^{2}+\sqrt{a}}{a-\sqrt{a}+1}$ - $\frac{2a+\sqrt{a}}{\sqrt{a}}$ + 1
Started By youaremyfriend, 07-07-2016 - 21:41
#1
Posted 07-07-2016 - 21:41
youaremyfriend
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Life is too short to hesitate
so do what you want so as not to regret
#2
Posted 07-07-2016 - 21:48
12345678987654321123456789
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Trung sĩ
Rút gọn được $A=a-\sqrt{a}=\left(\sqrt{a}-\frac{1}{2}\right)^2-\frac{1}{4}\geq-\frac{1}{4}$
Dấu "=" xảy ra khi và chỉ khi $a=\frac14$
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