In a certain conference each row of chairs has the same number of chairs, and the numberof row is 1 less than the number of chairs in a row.

How many chairs are in a row?

(1)There is a total of 72 chairs.

(2)After 1 chair is removed from the last row, there is a total of 17 chairs in  the last 2 rows.

这题我当时做模考看了10分钟愣是没看明白，没办法只好抄下来。后来自己再看，单词都这么简单但是还是不明白它表达的是一个什么意思，我就是绕不过来这个弯，哪位XDJM帮忙解释一下，谢谢了！

这个题意思是 每排椅子数相同 椅子的排数比每排的椅子树少一个

很好理解的

答案是A吧?

8乘以9等于72

应该是D吧！

条件二也可以推出来啊！（17+1）/2 = 9