问题
单项选择题
-1，6，-5，20，-27，( )
A．70
B．54
C．-18
D．72
答案
参考答案：A
解析：
各项都满足(-2)n+n。
搜题请搜索小程序“爱下问搜题”
-1，6，-5，20，-27，( )
A．70
B．54
C．-18
D．72
参考答案：A
解析：
各项都满足(-2)n+n。
| Month | Average Price per Dozen |
| April | $1.26 |
| May | $1.20 |
| June | $1.08 |
as many dozen were sold in April as in May, and twice as many were sold in June as in April, what was the average price per dozen of the eggs sold over the three-month period