Question

数轴上A，B两点对应的是书分别是√2和2，若点A关于点B的对称点为点C，则点C所对应的实数为

Answer 1

B点到A点的距离为，2-√2，B点到C点的距离为2-√2
C点=B点对应的坐标+A、B间距离=2+2-√2=4-√2

Answer 2

A = √2
B = 2
C = 2 + (B-A)
= 2+ (2-√2)
= 4 - √2

Answer 3

2+√2