(Ⅰ)求证:f(x)≥1﹣ 1x ;
(Ⅱ)设g(x)=x2f(x),且关于x的方程x2f(x)=m有两个不等的实根x1,x2(x1<x2).
(i)求实数m的取值范围;
(ii)求证:x1x22< e−e2 .
(参考数据:e=2.718, 1639e4639 ≈0.960, 9e2−24e ≈1.124, 1013 ≈0.769,ln2≈0.693,ln2.6≈0.956,ln2.639≈0.970.注:不同的方法可能会选取不同的数据)
⒈Underline the train.
⒉Point to the car.
⒊Colour the bike red.
⒋Tick the bus.
⒌ Circle the ship.