Вычислить: 

1)41+13+21+31=12;                                 4)-11+33+01+21=10;
2)42+10+2 (-1) 3(-1)=3;                           5)-12+30+0(-1) 2(-1)=-4;
3)43+11+23+31=22;                                 6)-13+31+03+21=2;