Question

ajudaaaa ae gente !!!????

Answer 1

1.
a) -3 + 5 . (10 - 7 - 4) → -3 + 5 . (-1) → -3 - 5 → -8
b) -16 : (- 8 + 7 - 3) → -16 : (-4) → 4
c) 15 - (16 - 9 + 4 - 7) → 15 - (4) → 15 - 4 → 11
d) -100 + 4 . (7 - 15 - 18) → -100 + 4 . (-26) → -100 - 104 → -204

2.
a) 3a - 4b + 5c - 7 . (a - b - c) → 3a - 4b + 5c - 7a + 7b + 7c → -4a + 3b + 12c
b) 18xy + 7xy + 4xy - 16xy → 13xy
c) a² - 5b + 7a . (a - 3) + 5b → a² - 5b + 7a² - 21a + 5b → 8a² - 21a
d) 18x²y + 7x . (7xy + 5y) - 35y → 18x²y + 49x²y + 35xy - 35y → 67x²y + 35xy - 35y

3.
a) (3y - 4)² → 9y² - 24y + 16
b) (2x + 12) . (2x - 12) → 4x² - 24x + 24x - 144 → 4x² - 144