问题
填空题
平面上，经过点A（2，0），B（0，-1）的抛物线有无数条，请写出其中一条确定的抛物线的解析式（不含字母系数）：______（写成一般式）．
答案
设抛物线的解析式为y=ax2+bx+c
把A（2，0），B（0，-1）代入得4a+2b+c=0 c=-1
故答案不唯一，如y=x2-
x-1．3 2
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平面上，经过点A（2，0），B（0，-1）的抛物线有无数条，请写出其中一条确定的抛物线的解析式（不含字母系数）：______（写成一般式）．
设抛物线的解析式为y=ax2+bx+c
把A（2，0），B（0，-1）代入得4a+2b+c=0 c=-1
故答案不唯一，如y=x2-
x-1．3 2
| 根据对话内容与上下文，在空白处填入适当的句子，使对话意思完整。 |
| A: Hi, Mary. Are you going to visit Beihai Park tomorrow? B: Yes. We'll start at 7:50. ____________________________________________? (1) A: I'd love to. But do you think it's going to rain tomorrow? B: _________________________________________________. (2) Look, there isn't any cloud in the sky. A: I hope it will be fine tomorrow. ______________________________________? (3) B: Not far. It'll take us half an hour. It's only 5 bus stops. A: You mean we'll go there by bus, is that right? B: Yes. ____________________________________________________________. (4) A: But I'd like to go there by bike. At that time the streets are very busy. Buses can't go faster than bikes. B: I agree with you. Going by bike can save both time and money. A: Yes. __________________________________________________________. (5) B: OK. Goodbye. A: Bye-bye. |