Question

Aiuda!!

12+3{-6+2[5-4(3-2)+5(7-8)]-5}

Answer 1

12+3 {-6+2 [5-12+8+35-40]-5}
12+3 {-6+10-24+16+70-80-5}
12-18+30-72+48+210-240-15
12+30+48+210-240-15-72-18
R= -45

Answer 2

12+3{-6+2[5-4(1)+5(-1)]-5}
12+3{-6+2[1-5]-5}
12+3{-6-8-5}
12+3{-19}
12-57=-45