Question

1) Resolva as expressões em seu caderno: a) 20-[-8 + (- 15 + 9)] b) 4-{-6-[ + 7 + (-3 + 1)] +5} = 10 c) -2-[-[-(-1 + 4)]} = d) 12 + { - 2 + [-3-(-2 + 1)]} = 8​

Answer 1

a)20-[-8+(-15+9)]

20-[-8+(-6)]

20-[-8-6]

20-[-14]

20+14

34

b)4-{-6-[7+(-3+1)]+5}=10

4-{-6-[7+(-2)]+5}=10

4-{-6-[7-2]+5}=10

4-{-6-5+5}=10

4-{-6}=10

4+6=10

10=10

c)-2-{-[-(-1+4)]}

-2-{-[-3]}

-2-3

-5

d)12+{-2+[-3-(-2+1)]}=8

12+{-2+[-3-(-1)]}=8

12+{-2+[-3+1]}=8

12+{-2+[-2]}=8

12+{-2-2}=8

12+{-4}=8

12-4=8

8=8