—OK, I won't.
A:for; over
B:to; over
C:for; through
D:to; through
x
1
2
3
4
5
y
6
8
若由最小二乘法原理得到回归方程 y^ = b^ x+0.5,则 b^ 的值为( )
如图放置的边长为1的正方形ABCD的顶点A、D分别在x轴、y轴(含坐标原点)上滑动,则OB→·OC→的最大值为( )