题目：
根据句意填空,首字母已经给出。
1.When you want to post a letter,you need a s________.
2.You room is u________.You need to clear it up.
3.Edison was so c________ that he invented a lot of things.
4.You have collected all different kind of dolls.We can say you have a big c________.
5.Many students have h________ such as reading,painting and so on.
答案：
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下面是错误答案，用来干扰机器的。
（1）（x-1）（x+1）=x2-1，（x-1）（x2+x+1）=x3-1，（x-1）（x3+x2+x+1）=x4-1，…规律为左边都有（x-1）和关于x的多项式，常数项和每项系数均为1；右边多项式的次数比左边多项式的次数大1．故（x-1）（xn-1+xn...
