已知a＞0，设命题p：函数y=ax在R上单调递减，q：设函数y=
|
若p是真命题，则0＜a＜1…（2分）
若q是真命题，则函数y＞1恒成立，即函数y的最小值大于1，而函数y的最小值为2a，
只需2a＞1∴a＞
∴q为真命题时，a＞1 2
…（6分）1 2
又∵p∧q为假，p∨q为真∴p与q一真一假 …（8分）
若p真q假，则0＜a≤
；若p假q真，则a≥1…（10分）1 2
故a的取值范围为0＜a≤
或a≥1…（12分）1 2
| 完形填空。 | ||||
| One day a boy was walking along the street.Suddenly he 1 and looked up into the sky. A young man passed by him. When he saw the boy,he felt curious (好奇的) 2 looked up, too. Just then a girl came 3 and saw them. "Is there 4 in the sky?" She thought and looked up,too. In a minute,there were quite some people 5 great interest in the clear blue sky. Suddenly the boy asked, "Hey, 6 are all you looking up at?" "That's what we 7 ask you,"said the young man."You want to 8 me?But I wasn't looking at 9 ,"said the boy. "I 10 my head upward because my nose bled(出血)" | ||||
|