Question

Me ajuda responde por favor.

Answer 1

Resposta:

a) 19320

b) 15480

Explicação passo-a-passo:

a)

6 × [(1 - 1/4) + (2 - 1/4) + (3 - 1/4) + ... + (80 - 1/4)]

6 × [3/4 + 7/4 + 11/4 + ... + 319/4

6 × [(3/4 + 319/4)/2 × 80]

6 × [322/4 × 40]

6 × 3220

19320

b)

(10 + 2(1 - 1)) + (10 + 2(2 - 1)) + (10 + 2(3 - 1)) + ... + (10 + 2(120 - 1))

10 + 12 + 14 + ... + 248

(10 + 248) × 120/2

258 × 60

15480