f(x)=|log3(x)|,若f(a)>f(2),求正数a的取值范围RT答案是a>2 or 0

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/17 16:42:18
f(x)=|log3(x)|,若f(a)>f(2),求正数a的取值范围RT答案是a>2 or 0
x)KӨдO72jt^t/MH iӆ=/z|g ;Xhg_``TOa`A!` X;ff XPYgÓKv1X;dQ$*4a2:AE u0UtѼ{ˢFQagF 1>`{ú

f(x)=|log3(x)|,若f(a)>f(2),求正数a的取值范围RT答案是a>2 or 0
f(x)=|log3(x)|,若f(a)>f(2),求正数a的取值范围
RT
答案是a>2 or 0

f(x)=|log3(x)|,若f(a)>f(2),求正数a的取值范围RT答案是a>2 or 0
f(2)=|log3(2)|
2>1,所以log3(2)>0
所以f(2)=log3(2)
|log3(x)|>log3(2)
所以log3(x)>log3(2)或log3(x)1,
所以log3(x)是增函数
log3(x)>log3(2)
所以x>2
log3(x)