1.How many positive whole numbers less than 81 are not equal squares of whole numbers?

A.9

B.70

C.71

D.72

E.73

答案：D

2. 23(784)

24(783)

答案：B

3.A printer numbered consecutively the pages of a book, beginning with 1 on the first page. In numbering the pages, he printed a total of 189 digits.

The number of pages in the book