trapez
2 -3 1
•14 0
-2
0 1
2
-1
0
2 -
T
9 + 2 A 2+0 + 2
-S
-2 -3 1 -1 4 O
= 14
T+0 + 0 = 1
-2 + 4 + 0 = 2