已知函数 ＞，其中r为有理数，且0<r<1. 则的最小值为_______；
The coldest season of the year is ．
Look! How Mark is running！He must win the race．
Don't to turn off the lights when you leave the classroom，Tom．
All right，Ms．Lee．
On school nights，I either do my homework read books．I never watch TV．
My two cousins look quite different．One is tall，but the other is ．
＞
，其中r为有理数，且0<r<1. 则
的最小值为_______；
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