Question

2+4 (-3+1)=
7+2-(3+9)=
5-10 (2+1)-(4+6)=
Con procedimiento plis urge

Answer 1

2+4(-3+1)=2+(-12+4)=2+(-8)=2-8=-6

7+2-(3+9)=9-(12)=9-12=-3

5-10(2+1)-(4+6)=5-(20+10)-(4+6)=5-(+30)-(+10)=5-30-10=-35