Tom had 6 books. He gave 2 to his sister and then purchased 3 more books at the bookstore. Which of the following mathematical e

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问题 Tom had 6 books. He gave 2 to his sister and then purchased 3 more books at the bookstore. Which of the following mathematical expressions is equivalent to the number of books that Tom now has?
   ______6-2+3
   ______6+2-3
   ______6(2+3)
   ______6(2-3)

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答案 You are given that Tom started out with 6 books. After he gave 2 books to his sister he was left with (6-2) books. He then purchased 3 more books, so he now has (6-2+3) books.

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