Tim wrote a seven digit-phone number on a piece of paper.He

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Tim wrote a seven digit-phone number on a piece of paper.He later tore the paper accidentally and the last two digits were lost.what is the maximum number of arrangements of two digits,using the digits 0 through 9,that he could use in attempting to reconstruct the correct phone number?
For all positive values of x,the function f is defined byf(x)=x^3-x^2.Of the following which is the best approxination of f(x)for values of x greater than 1000.
A) x^3
B)x^4
C)x^5
D)x^6
E)x^9

1.题目翻译：Tim在一张纸写了一个七位数的电话号码.后来,他不小心将纸撕了,导致号码的最后两位丢失.若它从0～9的数字中选择,最后两位数的排列最大有多少种可能?
要用到乘法原理的知识.从0～9中选,则后两位的第一位有10种可能,同理,第二位也有10种可能
所以10＊10＝100种可能
2.题目翻译：对于一切正数x,都有函数关系式f(x)=x^3-x^2.下面当x>1000时,下面哪个选项的值最接近f(x)的值?
当x>1000时,f（x）肯定至少是9位数,那么最紧接的就是x^3嘛
选A

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