4 2 0X X2VẬY X0 HOẶC 1X
1.4 2 0x x2Vậy x0 hoặc 1x . 2b) Bx
3
3x2
5x2m 3
2
2
2 2 3 6 6 2x x x x x m
2
x x x x x m2 2 3 2 6 23
3x2
5x2m 3
2
2
2 2 3 6 6 2x x x x x m2
x x x x x m2 2 3 2 6 2