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数学
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已知集合P={x/根号2+1
人气:401 ℃ 时间:2020-03-24 09:11:02
解答
MUN=N
说明N是大范围,M是小范围
解N集合,因为√2 + 1 ≤ x ≤ 3
所以N = {y | 1 ≤ y ≤ 3}
M集合中,x² - (a + 1)x + a ≤ 0
所以(x - a)(x - 1)≤ 0
要使得M范围小
所以a可以取1,且a不能比1小
所以1 ≤ a ≤ 3
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