題組內容
5. Evaluate the following integrals.
poo lnx
(c) (10%) 
dA, where R is the region bounded by xy=1, xy=3, y=x, y=2x,by the setting u =xy, 
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(c) (10%) dA, where R is the region bounded by xy=1, xy=3, y=x, y=2x,by the setting u =xy,