C
custar


Trong khong gian voi he truc toa do Oxyz, cho cac diem A(-1,1,0) ; B( 0,0,2)
C(1,1,1). Viet' pt mat phang (P) qua 2 diem A va B dong thoi khoang cah tu C toi' mp (P) bang can 3. lam di to thnk cho
C(1,1,1). Viet' pt mat phang (P) qua 2 diem A va B dong thoi khoang cah tu C toi' mp (P) bang can 3. lam di to thnk cho