问题
填空题
已知f（x）=
|
答案
由分段函数的解析式可得f（2）=-2×2+3=-1，
∴f[f（2）]=f（-1）=（-1）2+1=2
故答案为：2
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已知f（x）=
|
由分段函数的解析式可得f（2）=-2×2+3=-1，
∴f[f（2）]=f（-1）=（-1）2+1=2
故答案为：2
| 选择合适的单词填空，填序号。 | ||
| Mary is a little girl. She is only five. She __1__ go to school. She doesn't know how to read 2__ write. But her sister Joan is a school girl. She is ten. She 3 how to read 4 write. One day, Joan sees her little sister in the study. She is at the table. There 5 a pencil in her hand. She is __6 something there. " 7 are you writing, Mary?" she asks. ''I'm writing _ 8 my friend Rose." "But how can you do it? You don't know __9 to write."says her sister. "Well. It doesn't matter. Rose doesn't know how to read, 10 ." | ||
( ) 1. A. don't | B. aren't B. or B. knows B. or B. is B. writing B. When B. in B. how B. to | C. doesn't C. of C. knowing C. of C. are C. writes C. What C. with C. where C. two |