Jawabanmu

2014-08-10T14:25:55+07:00
2014-08-10T14:26:30+07:00
2ab + bc - 3ac² = 2 (1) (-1) + (-1) (2) - 3 (1) (2) ²
                       = -2 -2 -12 = -16
1 5 1