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若角α、β满足π/-2按照不等式等价变形即可.-π按照不等式等价变形即可。-π-π/2所以-3/2π又2α综上，得解．

若角α、β满足π/-2
若角α、β满足π/-2

若角α、β满足π/-2
按照不等式等价变形即可.
-π

按照不等式等价变形即可。
-π<2α<π，
-π/2<-β<π/2，
所以-3/2π<2α-β<3/2π，
又2α<2β，所以2α-β<β<π/2，
综上，得解．

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