Hoàng H
08 tháng 12 2022 14:42
câu hỏi
Cho a,b,c > 0 thoả mãn a2+b2+c2 = 1. Chứng minh 1/√a2+1 +1/b2+1 +1/c2+1 ≤ 9/2(a+b+c)
13
1
Lê M
08 tháng 12 2022 14:45
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