若角α、β满足π/-2

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若角α、β满足π/-2
若角α、β满足π/-2<α<β<π/2,则2α-β的取值范围是

若角α、β满足π/-2
没有其他条件了?这好办.
2α>-π,-β>-π/2,加起来就是2α-β>-3π/2;
α

∵﹣π/2<α<β<π/2
∴﹣π＜2α＜π,
﹣π/2<﹣β<π/2
∴﹣3π／2＜2α-β＜3π／2

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