BÀI 15. CHO ĐƯỜNG THẲNG X 1 Y 2 ZD
1. Gọi
M x( ;1; )z ( )P, ta có:
x− + + = = −1 z 1 0 x zSuy ra
2
2
2
2
( 1) ( 1) ( 2)MA =MB x− + z− =x + z− −2x−2z+ = −2 4z+41 1 = = −2
2
2
2
( 1) ( 1) ( 2)MA =MB x− + z− =x + z− −2x−2z+ = −2 4z+41 1 = = −