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设x<sub>i</sub>】0,0【q<sub>i</sub>【1,i=1,2,…n,sum from i=1 to n q<sub>1</sub>=1,则sum from i=1 to n q<sub>i</sub>x<sub>i</sub>≥multiply from i=1 to n x<sub>i</sub>q<sub>i</sub&g