已知集合A={x︱-2≤X≤a},B={y︱y=2x+3,x∈A},C={z︱z=x²,x∈A},且C包含于B,求的取值范围.
人气:403 ℃ 时间:2019-08-20 12:16:49
解答
已知-2≤X≤a
则-1≤2X+3≤2a+3
所以B={yI -1≤y≤2a+3}
又0≤X²≤a² (a≥2)或0≤x²≤4
则C={zI 0≤z≤a²,a≥2}或{zI 0≤z≤4,a
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