已知集合A={x丨x^2-3x-10<=0},B={x丨m+1<=x<=2m-1},且B ⊆A,求实数m的取值范围
人气：332 ℃ 时间：2020-01-25 06:30:55
解答
x^2-3x-10<=0
(x-5)(x+2)<=0
-2<=x<=5
由B包含于A则-2<=m+1<=5 ,-2<=2m-1<=5 ,m+1<=2m-1
解得1<=m<=3
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