Question

Calcula.
10. - 5 – (+11) - (-20)
11. 9 - [(-5) – (+7)]
12. -7 - [(-3) - (-9)]
13. – 11 – [(+6) – (+4)]
14. +8 – [(+5) – (-9)]
15. (+4) + [(+3) + (-7)] + (+1)
16. -(-3) + {(-5) – [(+8) + (-10)]}

Answer 1

10. -5-(+11)-(-20)= -5-11+20= -16+20= 4

11. 9-[(-5) - (+7)]= 9 - [-5-7]= 9- [-12]= 9+12= 21

12. -7-[(-3) - (-9)]= -7-[-3+9]= -7-[6]= -7-6= -13

13. -11-[(+6) - (+4)]= -11-[+6-4]= -11-[2]= -11-2= -13

14. +8-[(+5) - (-9)]= +8-[+5+9]= +8-[14]= +8-14= -6

15. (+4)+[(+3)+(-7)]+(+1)= +4+[+3-7]+1= +4+[-4]+1= +4-4+1= 1

16. -(-3)+{(-5)-[(+8)+(-10)]}= +3+{-5-[+8-10]}= +3+{-5-[-2]}= +3+{-5+2}= +3+{-3}= +3-3=0