若角α,β满足-π/2<α<β<π/2,则2α-β的取值范围是
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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<α<β<π/2,则2α-β的取值范围是
若角α,β满足-π/2<α<β<π/2,则2α-β的取值范围是
∵ - π / 2 < a < π / 2
∴ - π < 2 a < π
∵ - π / 2 < b < π / 2
∴ - 3 π / 2 < 2 a - b < π/2
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-π/2<α<π/2, 不等式同乘以2,不等号方向不变,所以得到-π<2α<π
-π/2<β<π/2, 不等式同乘以-1,不等号方向改变,-π/2*(-1)>-β>π/2*(-1),
所以得到-π/2<-β<π/2
所以-π<2α<π
-π/2<-β<π/2
两式相加,得到-π+(-π/2)<2α+(-β)<π+π/2<...
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-π/2<α<π/2, 不等式同乘以2,不等号方向不变,所以得到-π<2α<π
-π/2<β<π/2, 不等式同乘以-1,不等号方向改变,-π/2*(-1)>-β>π/2*(-1),
所以得到-π/2<-β<π/2
所以-π<2α<π
-π/2<-β<π/2
两式相加,得到-π+(-π/2)<2α+(-β)<π+π/2
所以-3π/2<2α-β<3π/2
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∵ - π / 2 < a < π / 2
∴ - π < 2 a < π
∵ - π / 2 < b < π / 2
∴ - 3 π / 2 < 2 a - b < 3 π / 2
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