设函数y=f(x)的定义域为(1，2]，则f(ax)(a
A <img src="https://www.beizhujiaoyu.com/uploads/202208/161197521524421.png" width="60" height="34" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/161197522143221.png" width="59" height="34" /> C (a，2a] D <img src="https://www.beizhujiaoyu.com/uploads/202208/161197522878001.png" width="51" height="34" />
