搜题请搜索小程序“爱下问搜题”
问题 填空题

已知点（2，5），（4，5）是抛物线y=ax2+bx+c上的两点，则这条抛物线的对称轴是______．

答案

因为已知两点的纵坐标相同，都是5，

所以对称轴方程是x=（2+4）÷2=3．

单项选择题

Mr. Kramer, the losing candidate in a two-candidate election, received 942, 568 votes, which was exactly 40 percent of all the votes cast．Approximately what percent of the remaining votes would he need to have received in order to have won at least 50 percent of all the votes cast ？（）

A．10%

B．12%

C．15%

D．17%

E．20%
查看答案
单项选择题

患者50岁，确诊宫颈鳞癌Ⅰa2期，最佳治疗方案是

A．子宫大部分切除术加双附件切除术

B．广泛性全子宫切除加盆腔淋巴结清扫术

C．宫颈锥形切除术

D．次广泛全子宫切除术

E．广泛性子宫切除术
查看答案