问题
填空题
函数y=2x-1的值域为______.
答案
由于 2x>0,∴2x-1>-1,故函数 y=2x-1的值域为(-1,+∞),
故答案为 (-1,+∞).
函数y=2x-1的值域为______.
由于 2x>0,∴2x-1>-1,故函数 y=2x-1的值域为(-1,+∞),
故答案为 (-1,+∞).
从方框中选择适当的答语完成下面的对话,并将选项字母填入方框下相应题号的横线上,备选答语中有两项为多余选项。 A: Good afternoon, Mr. White. B: Good afternoon. 小题1: A: Very well, thanks. And you? B: I’m fine, too. The school term is nearly over. 小题2: A: I’m going to take courses(课程)in a winter school. B: 小题3: A: English and computer. B: 小题4: A: Because English and computer are getting more and more important in our life. B: 小题5:I hope you will work hard at them.
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