已知F是抛物线y2=x的焦点，A，B是该抛物线上的两点，AF+BF=3，则线段AB的中点到y轴的距离为( )

题干

已知F是抛物线y²=x的焦点，A，B是该抛物线上的两点，AF+BF=3，则线段AB的中点到y轴的距离为( )

A： $\frac{3}{4}$

B：1

C： $\frac{5}{4}$

D： $\frac{7}{4}$

上一题下一题 0.0难度选择题更新时间:2017-05-20 07:18:09

Wang Lei
How old is he?	1.
Where does he live?	2.
How far is it from his school?	3.
How does he get to school?	4.
Why did the whole school know him?	Because he got the first place in 5.