问题
填空题
函数f(x)=log2(4-x2)的值域为______．
答案
∵0＜4-x2≤4，∴log2(4-x2)≤log24=2．
∴函数f(x)=log2(4-x2)的值域为（-∞，2]．
故答案为（-∞，2]．
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函数f(x)=log2(4-x2)的值域为______．
∵0＜4-x2≤4，∴log2(4-x2)≤log24=2．
∴函数f(x)=log2(4-x2)的值域为（-∞，2]．
故答案为（-∞，2]．
A. Thursdays B. Wednesdays C. weekdays 小题2:Pizza is a kind of____________. A. drink B. fruit C. food 小题3:Paula’s favorite sport is___________. ‘ A. soccer B. table tennis C. yo-yo 小题4:On Wednesday evenings Paula usually___________. A. watches TV B. does her homework C. washes her clothes 小题5:Which is right? A. Paula usually has pizza for lunch. B. Paula goes to bed before ten o’clock. C. Paula goes to school from Monday to Friday. |
