Question

1°) calcule as expressões numéricas.
A) 3.15+2.9
B) 12÷4+3.11
C) 1+3.2-4
D) 2+(3.7-10)+25
E) -10-{+8 - [-5+(20÷5+2.4)]}
F) 25+(9-2.6+4÷2) - (8.8-20)
G) 75+[+2-(-18÷3-5)]

2°) Determine:
A) (-4+20)÷(-8)
B) (-6-14)÷(-6+1)
C) (-8).(+3)-(-15)÷(+3)
D) [-8+.(-4).(-3)÷(-1-1)
E) -20÷{-6+[(-2).(-3)÷(+2)]-2}
F) 10-{-6+[(-12)÷(-3)-8]}

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Answer 1

Explicação passo-a-passo:

1°) (A) 45+18

=63

B) 3 + 33

= 36

C) 1 + 6 - 4

= 7 - 4

= 3

D) 2+ ( 21 + 10) + 25

= 2+ 31 + 25

= 33 + 25

= 58