要不这样,你应该是想说p+q+r=3吧.那么,由lnx的上凸性,
plna+qlnb+rlnc≤ln[(pa^3+qb^3+rc^3)/3]
qlna+rlnb+plnc≤ln[(qa^3+rb^3+pc^3)/3]
rlna+plnb+qlnc≤ln[(ra^3+pb^3+qc^3)/3]
100字不够写啊!
要不这样,你应该是想说p+q+r=3吧.那么,由lnx的上凸性,
plna+qlnb+rlnc≤ln[(pa^3+qb^3+rc^3)/3]
qlna+rlnb+plnc≤ln[(qa^3+rb^3+pc^3)/3]
rlna+plnb+qlnc≤ln[(ra^3+pb^3+qc^3)/3]
100字不够写啊!