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y=1000/x∈(10100) x=1000/y∈(10100) (lgx)(lgy)=(lgx)(3-lgx)=-lg²;x+3lgx=-(lgx-3/2)²;+9/4 ∵x∈(10100) ∴lgx∈(1,2) ∴(lgx)(lgy)∈(2,9/4)
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