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uy22

Đây:
(a+b)/2>=canbachai(ab)
nên VP>=canbachailn(canbachai(ab))=canbachai(1/2ln(ab))=canbachai(1/2(lna + lnb))
đặt a = canbachai(lna) a^2 = lna
b = canbachai(lnb) b^2 = lnb
canbachai(1/2(lna + lnb)) = canbachai(1/2(a^2 + b^2) >= canbachai(1/2*1/2(a + b)^2) (cauchy)=1/2(a + b) = 1/2(canbachai(lna) + canbachai(lnb))= VT
 
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