选择方框中合适的句子还原到短文中。

①____. But how much do you know about headaches? What may cause(引起) them? And what should we do if we have a headache? When should we go to see a doctor?

②____, but it may show that something in our body is wrong. We may have more than one headache each month.

③____. We may get a headache when we work too hard. We may get a headache when we don't get enough sleep. We may get a headache when we exercise on an empty stomach.

What should we do if we have a headache?

④____. We should have a good sleep. We shouldn't take too much exercise if we are hungry.

⑤____, we need to see a doctor.

57×4×5＝____

如图，在△ABC中，∠B=90°，AB=10．将△ABC沿着BC的方向平移至△DEF，若平移的距离是6，则图中阴影部分的面积为____ 

已知椭圆C： $\frac{x^2}{a^2}+\frac{y^2}{b^2}=1(a>b>0)$ 的上顶点坐标为 $\left(0,\sqrt{3}\right)$ ，离心率为 $\frac{1}{2}$ ,解决问题：（1）求椭圆方程；（2）设P为椭圆上一点，A为左顶点，F为椭圆的右焦点，求 的取值范围.