vector

數學神童

谁可以explain 什么是vector equation?就是那个r=a+tb.

多普勒效应

b 是那个线的方向. 如果单单是 r = tb, 所标示的就是通过原点, 与 a + tb 平行的线.
加 a 就把 r = tb 平移到他成为通过点 a 的直线.

數學神童

find the equation of the plane which is parallel to the plane 3x+2y-6z-24=0 and passes through the point (1,0,0).hence determine the distance between these two planes.