先求AB直线方程:
(x-1)/(2-1)=(y+2)/(1+2)=(z-3)/(-3-3),that is:
(x-1) = (y+2)/3 = -(z-3)/6 = t,so:
x = t+1
y = 3t-2
z = 3-6t
平面yoz上,x=0,t=-1,so:
y=-5,z=9
that is:P(0,-5,9)
先求AB直线方程:
(x-1)/(2-1)=(y+2)/(1+2)=(z-3)/(-3-3),that is:
(x-1) = (y+2)/3 = -(z-3)/6 = t,so:
x = t+1
y = 3t-2
z = 3-6t
平面yoz上,x=0,t=-1,so:
y=-5,z=9
that is:P(0,-5,9)