不等式(3/4)^x^2-2x-5
问题描述:
不等式(3/4)^x^2-2x-5
数学人气:677 ℃时间:2020-02-06 04:51:37
优质解答
∵(3/4)^(x^2-2x-5)∴(3/4)^(x^2-2x-5)∴x^2-2x-5>-2
即:x^2-2x-3>0
(x-3)(x+1)>0
解得:x>3或x
即:x^2-2x-3>0
(x-3)(x+1)>0
解得:x>3或x
答
∵(3/4)^(x^2-2x-5)∴(3/4)^(x^2-2x-5)∴x^2-2x-5>-2
即:x^2-2x-3>0
(x-3)(x+1)>0
解得:x>3或x