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解不等式:log3^(5+x)+log3^(x-1)≤3
加是乘,怎么会是加在呢!
人气:452 ℃ 时间:2020-01-30 03:49:52
解答
原不等式=》 log3^(5+x)(x-1)≤log3^9
因为log3^X在实数范围内为增函数,所以
(5+x)(x-1)≤9
解得 -2-2倍根号5≤ X≤-2+2倍根号5
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