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AI GIUP EM VOI CO THUOG DAY 1 , CHUNG MINH RANG(a√+b√)8 ≥64ab(a+b)2 \forall a,b ≥02, chung minh rang3a3+7b3 ≥9ab2 3,cho a,b,c,d>0, 1a+1+1b+1+1c+1+1d+1 \geq 34 ,cho x1,x2,,............xn>0va 11+x1+........+11+xn \leq n−1chungminhrang x1.x2............xn ≤ 1(n−1)n
AI GIUP EM VOI CO THUOG DAY 1 , CHUNG MINH RANG(a√+b√)8 ≥64ab(a+b)2 \forall a,b ≥02, chung minh rang3a3+7b3 ≥9ab2 3,cho a,b,c,d>0, 1a+1+1b+1+1c+1+1d+1 ≥ 34 ,cho x1,x2,,............xn>0va 11+x1+........+11+xn ≥ n−1chungminhrang x1.x2............xn ≤ 1(n−1)n
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