2(log2x)^2-7log2x+3<=0 1/2=<log2 x<=3 F(X)=LOG2(X/2)*LOG2(X/4) =(log2 x -1)(log2 x -2) =(log2 x)^2-3log2 x +2 =(log2 x -3/2)^2-1/4 所以F(x)最小值在对称轴log2 x=3/2处取得,最小值为-1/4; F(x)最大值在log2 x=3处取得,为2
2(log2x)^2-7log2x+3<=0 1/2=<log2 x<=3 F(X)=LOG2(X/2)*LOG2(X/4) =(log2 x -1)(log2 x -2) =(log2 x)^2-3log2 x +2 =(log2 x -3/2)^2-1/4 所以F(x)最小值在对称轴log2 x=3/2处取得,最小值为-1/4; F(x)最大值在log2 x=3处取得,为2