Question

Calcule:

A)– 21 + 13 + 22 – 19 =
B)– 82 + 43 + 45 – 17 =
C)– 21 + 31 + 19 – 16 + 61 =

com o cálculo pfv​

Answer 1

Resposta:

a) – 21 + 13 + 22 – 19 =

   = -8+22-19

   = +14-19

   = -5

b) – 82 + 43 + 45 – 17 =

   = -39+45-17

   = +6-17

   = -11

c) – 21 + 31 + 19 – 16 + 61 =

   = +10+19-16+61

   = +29-16+61

   = +13+61

   = 74

Answer 2

Resposta:

A)-5

B)-11

C)74

Explicação passo-a-passo:

A)-21+13+22-19

-(21+19)+13+22

-40+13+22

-40+35

-5

B)-82+43+45-17

-(82+17)+43+45

-99+43+45

-99+88

-11

C)-21+31+19-16+61

-(21+16)+31+19+61

-37+31+19+61

-37+111

74