已知函数y=x（3-2x）（0＜x≤1），则函数有最大值为 。
9/8
，其对称轴为，
所以当时，有最大值为。
During an accounting period a company had the following sequence of transactions: Beginning inventory is zero. The company purchased 500 units at $15. The company purchased 600 units at $16. The company sold 400 units at $18. The company sold 550 units at $ 20. Cost of goods sold (COGS) using last-in first-out (LIFO) inventory accounting and ending inventory using first-in first-out (FIFO) are closest to: LIFO COGS FIFO ending inventory ①A. $14700 $ 2400 ②B. $14 700 $ 3350 ③C. $14850 $ 2400
A．
B．
C．
足月儿生后添加维生素D制剂的时间是（）。
A.1周
B.2周
C.3周
D.4周
E.3个月
，其对称轴为
，
时，
有最大值为
。
，其对称轴为，时，有最大值为。