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数学
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x为何值时,根号2x+5+根号5-2x有意义
人气:469 ℃ 时间:2019-10-27 14:32:32
解答
根号的数要>=0,所以 有.
2x+5>=0 且 5-2x>=0
即
x>=-5/2 且 x
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