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lgx*lgy=lgx*lg(1000/x)=lgx(lg1000-lgx)=-(lgx)^2+3lgx令lgx=t∈R=-t^2+3t=-(t-3/2)^2+9/4對稱軸t=3/2f(t)在t∈(-∞,3/2]上單調遞增在t∈[3/2,+∞)上單調遞減取最大值時t=3/2即x=y=10√10 lgx*lgy=9/4lgx*lgy∈(-…
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