设P坐标为(x,y),则向量P1P=(x-1,y+2),向量PP2=(-3-x,5-y)
由向量P1P=(-1/2)向量PP2,得:x-1=(-1/2)(-3-x),y+2=(-1/2)(5-y)
解得:x=5,y=-9 所以P点的坐标为(5,-9).
设P坐标为(x,y),则向量P1P=(x-1,y+2),向量PP2=(-3-x,5-y)
由向量P1P=(-1/2)向量PP2,得:x-1=(-1/2)(-3-x),y+2=(-1/2)(5-y)
解得:x=5,y=-9 所以P点的坐标为(5,-9).