1.Với x> -1 . Tìm GTNN của $y = \dfrac{3x}{2}+ \dfrac{1}{x+1} $ .
2. Cho 3 số thực thỏa mãn $0 \leq a;b;c \leq 1$
CMR $ \dfrac{a}{bc+1}+ \dfrac{b}{ac+1}+ \dfrac{c}{ab} \leq 2 $
BĐT
Bắt đầu bởi hutdit999, 18-01-2010 - 17:08
#1
Đã gửi 18-01-2010 - 17:08
Can't you believe that you light up my way
No matter how that ease my path
I'll never lose my faith
See me fly , I'm proud to fly up high
Show you the best of mine
Till the end of the time
Believe me I can fly , I'm singing in the sky
Show you the best of mine
The heaven in the sky
Nothing can stop me , Spread my wings so wide
No matter how that ease my path
I'll never lose my faith
See me fly , I'm proud to fly up high
Show you the best of mine
Till the end of the time
Believe me I can fly , I'm singing in the sky
Show you the best of mine
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#2
Đã gửi 18-01-2010 - 18:46
Câu 2 nó ko đối xứng à bạn,Nếu ko đối xứng thì ko dễ rùi1.Với x> -1 . Tìm GTNN của $y = \dfrac{3x}{2}+ \dfrac{1}{x+1} $ .
2. Cho 3 số thực thỏa mãn $0 \leq a;b;c \leq 1$
CMR $ \dfrac{a}{bc+1}+ \dfrac{b}{ac+1}+ \dfrac{c}{ab} \leq 2 $
Câu1:$y+ \dfrac{3}{2}= \dfrac{3(x+1)}{2}+ \dfrac{1}{x+1} \geq \sqrt{6}$
$ \Rightarrow Min y= \sqrt{6}-3/2$
#3
Đã gửi 19-01-2010 - 02:27
2. Cho 3 số thực thỏa mãn $0 \leq a;b;c \leq 1$
CMR $ \dfrac{a}{bc+1}+ \dfrac{b}{ac+1}+ \dfrac{c}{ab} \leq 2 $
Thử với : $ a=1 ;b=\dfrac{1}{2};c=1 $
#5
Đã gửi 20-01-2010 - 16:55
À do em sơ ý , đúng là bài 2 nó có quy luật ạ . Em sẽ sửa ở phần trên
Can't you believe that you light up my way
No matter how that ease my path
I'll never lose my faith
See me fly , I'm proud to fly up high
Show you the best of mine
Till the end of the time
Believe me I can fly , I'm singing in the sky
Show you the best of mine
The heaven in the sky
Nothing can stop me , Spread my wings so wide
No matter how that ease my path
I'll never lose my faith
See me fly , I'm proud to fly up high
Show you the best of mine
Till the end of the time
Believe me I can fly , I'm singing in the sky
Show you the best of mine
The heaven in the sky
Nothing can stop me , Spread my wings so wide
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