双曲线=1的焦点坐标为(    )A.(-,0)、(,0)                   

双曲线=1的焦点坐标为(    )

A.(-,0)、(,0)                         B.(0,-)、(0,)

C.(-5,0)、(5,0)                               D.(0,-5)、(0,5)

答案

答案:

C∵a=4,b=3,∴c=5.又∵焦点在x轴,∴焦点为(±5,0).故选C.

相关题目

下列实验装置或操作不符合实验要求的是
下列实验装置或操作不符合实验要求的是
右图为衢州历史名人赵抃祠,赵抃字阅道,衢州西安(今浙
右图为衢州历史名人赵抃祠,赵抃字阅道,衢州西安(今浙江衢州 市)人。景祐元年进士,任殿中侍御史,弹劾不避权势,时称“铁 面御史”。平时以
、已知,则实数的值为( ) (A)1           (B) -1    
、已知,则实数的值为( ) (A)1           (B) -1           (C) 2          (D) -2  
It is worth ____ considering the problem. A.when           B. as    
It is worth ____ considering the problem. A.when           B. as                C. while                D. since
某大型游乐场内,有一种能使人感觉身体超重、失重的大型
某大型游乐场内,有一种能使人感觉身体超重、失重的大型娱乐设施,该设施用电梯将乘坐有十多人的座舱悬停在几十米的高空处,然后让座舱从高空
In Shanghai, people______ thousand tons of watermelon every summer. A. swallow 
In Shanghai, people______ thousand tons of watermelon every summer. A. swallow   B. eat    C. consume   D. exhaust
Growing up in the USA, I was ashamed of my mother’s Chinese English. Because o
Growing up in the USA, I was ashamed of my mother’s Chinese English. Because of her English, she was often treated unfairly. People in department stores, at banks, and at restaurants did not take he
下列各组词语中,有两个错别字的一组是( ) A.瞳孔 名利场
下列各组词语中,有两个错别字的一组是( ) A.瞳孔 名利场 荒烟漫草 面面相觑 游子悲故乡 B.逻楫 坏兆头 无动于衷 惊世骇俗 悠然见南山 C.甬道 防

最新题目