设A=｛x丨logx(5x²-8x+3)＞2｝，B=｛x丨x²-2x-a4次方+1≥0｝，已知A真包含于B，求a的取值范围

设A=｛x丨logx(5x^2-8x+3)＞2｝，B=｛x丨x^2-2x-a^4+1≥0｝，已知A真包含于B，求a的取值范围 logx(5x^2-8x+3)＞logx(x^2) logx[(5x^2-8x+3)/x^2]>logx(1) [(5x^2-8x+3)/x^2]>1 (5x^2-8x+3-x^2)/x^2>0 (4x^2-8x+3)x^2>0 2 -1 2 -3 (2x-1)(2x-3)x^2>0 x1