There're five members in my family—my parents , my grandparents, and me . My mother is a teacher. She teaches Chinese in our school. She likes music. My father is a teacher, too. He teaches art in the Guang Ming primary school. He likes going hiking. My grandmother is a worker. She likes reading books. My grandfather is a scientist. He likes playing chess. I am Betty. I'm in Shi Yan primary school. I like singing and dancing. Look! I have a happy big family. Isn't it?

成长的路上，我们总是后知后觉。有一种好，总是转个弯，然后才察觉；有一种爱，总是会延迟，过后才懂。

请以“有一种爱，过后才懂”为题，写一篇文章。

要求：（1）自选文体（诗歌除外），不少于600字。（2）感情真挚，不得抄袭。（3）文中不得出现真实的人名、校名、地名。（4）认真书写。

材料：将分式 $\frac{-x^4-x^2+3}{-x^2+1}$ 拆分成一个整式与一个分式（分子为整数）的和的形式．

解：由分母为﹣x²+1，可设﹣x⁴﹣x²+3=（﹣x²+1）（x²+a）+b则﹣x⁴﹣x²+3=（﹣x²+1）（x²+a）+b=﹣x⁴﹣ax²+x²+a+b=﹣x⁴﹣（a﹣1）x²+（a+b）

∵对应任意x，上述等式均成立，∴ $\{\begin{array}{c}a-1=1\\ a+b=3\end{array}$ ，∴a=2，b=1

∴ $\frac{-x^4-x^2+3}{-x^2+1}$ = $\frac{\left(-x^2+1\right)\left(x^2+2\right)+1}{-x^2+1}$ = $\frac{\left(-x^2+1\right)\left(x^2+2\right)}{-x^2+1}$ + $\frac{1}{-x^2+1}$ =x²+2+ $\frac{1}{-x^2+1}$ 这样，分式 $\frac{-x^4-x^2+3}{-x^2+1}$ 被拆分成了一个整式x²+2与一个分式 $\frac{1}{-x^2+1}$ 的和．

解答：

在“探究凸透镜成像规律”的实验中，如图所示，小明将焦距为10cm的凸透镜固定在光具座上50cm刻度线处不动．调节烛焰、凸透镜和光屏的中心在同一高度，将蜡烛移至光具座上20cm处，移动光屏，在光屏上得到一个倒立、 ____的实像．要在光屏上成放大的像，蜡烛应向 ____移动，光屏应向 ____移动（均选填“左”或“右”）．