a,cho hai day so cung chieu a1<=a2<=a3 va b1<=b2<=b3. chung minh rang (a1+a2+a3)(b1+b2+b3)<=3(a1b1+a2b2+a3b3)?

b,chung minh rang voi 0<=a<=b<=c thi :(a^2005+b^2005+c^2005)/(a^2006+b^2006+c^2006)<=3/(a+b+c

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