Question

A) (-7)+(-2)+(-5)

B) -5/3 x -4/3

C) 5/2 - 8/10

D) 5/8 ÷ 2/3

E) -2/10 x 4/3

F) (3³+5x3)² x {5x [1700 - (42x2+8)²]}​

Answer 1

a) (-7) + (-2) + (-5)

-7 - 2 - 5

-9 - 5

-14

b) (- 5/3) × (- 4/3)

5/3 × 4/3

5.4/3.3

20/9

c) 5.10-8.2/2.10 ← método borboleta

50-16/20

34/20

17/10

d) 5/8 ÷ 2/3

5/8 × 3/2

5.3/8.2

e) - 2/10 × 4/3

- 1/5 × 4/3

- 1.4/5.3

- 4/15

f) (3³ + 5 × 3)² × {5[1700 - (42 × 2 + 8)²]}

(27 + 15)² × {5[1700 - (84 + 8)²]}

42² × {5[1700 - (92)²]}

1764 × {5[1700 - 8464]}

1764 × {5 × [−6764]}

1764 × {−33820}

-59658480