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
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. |