SAT Math求翻译和解析
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SAT Math求翻译和解析
In the exact middle of a certain book, when the page numbers on the facing pages , x and x+1, are multiplied together , the product is 210. if all of the pages are numbered in order, How many numbered pages are in the book ? 答案是28,怎么算出来的?题目又是什么意思?
In the exact middle of a certain book, when the page numbers on the facing pages , x and x+1, are multiplied together , the product is 210. if all of the pages are numbered in order, How many numbered pages are in the book ? 答案是28,怎么算出来的?题目又是什么意思?
![SAT Math求翻译和解析](/uploads/image/z/11362921-25-1.jpg?t=SAT+Math%E6%B1%82%E7%BF%BB%E8%AF%91%E5%92%8C%E8%A7%A3%E6%9E%90)
两个连续的整数相乘等于210,这两个数只能是14和15,既然这两页是这本书的exact middle,那么这本书肯定就是28页了(左边1-14,共14页,右边15-28,也是14页).