中点公式
midpoint formula The coordinates of the midpoint of the segment joining $P_1(x_1,y_1,z_1)$ and $P_2(x_2,y_2,z_2)$ are $\left(\frac{x_1+x_2}{2}, \frac{y_1+y_2}{2
CSCA 数学 考试术语
midpoint formula The coordinates of the midpoint of the segment joining $P_1(x_1,y_1,z_1)$ and $P_2(x_2,y_2,z_2)$ are $\left(\frac{x_1+x_2}{2}, \frac{y_1+y_2}{2
CSCA 数学 考试术语