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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: cho a,b,cthoa man a^2+b^2 +c^2>=3/4

Toán Lớp 8: cho a,b,cthoa man a^2+b^2 +c^2>=3/4

Comments ( 1 )

  1. Áp dụng BĐT : (x – y)2 ≥ 0 ∀x ⇒ x2 + y2 ≥ 2xy Ta có : a2 + b2 ≥ 2ab b2 + c2 ≥ 2bc c2 + a2 ≥ 2ac ⇒ 2( a2 + b2 + c2) ≥ 2( ab + bc + ac) ⇒3( a2 + b2 + c2 ) ≥ ( a + b + c)2 ⇔ a2 + b2 + c2 ≥ ( a + b + c ) 2 3 = 9 4 . 1 3 = 3 4

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222-9+11+12:2*14+14 = ? ( )

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