I.10.30 Flux of the Vector Field

Condition: with the help of Ostrogradsky theorem, calculate the vector field \ (\ vec {a} \) through the specified closed surface \ (\ sigma \). \ (\ vec {a} = 3 x I-2 z j+y k, \ sigma- \) part of the plane \ (x+y+z = 2 \) located in the first octress.