Question

A) -15+[-4-(-5+20)]}

B)20-{-10+[+20-(-20+10)]}

C) -12+(-6)-(-8-5)

Answer 1

A) -15+[-4-(-5+20)]
-15+[-4- 15}
-15 - 19
-34

B) 20-{-10+[+20-(-20+10)]}
20-{-10+[+20-(-10)]}
20-{-10+[+20 + 10]}
20-{-10+30}
20- 20
0

C) -12+(-6)-(-8-5)
-12 - 6  - (-13)
-18 + 13
- 5