Resposta:

b) 20xy + 17xy - 5xy = 37xy

c) 2ab + 1.5ab - 2.3ab = 1.2ab

d) -3.1x²y + 4.5x²y - 2.7x²y = -1.3x²y

e) 10bc + 12bc + 7bc - 3bc = 26bc

f) 1.1ab³ - 3.5ab³ - 0.9ab³ + 2.8ab³ = -0.5ab³

g) x²y² - 5x²y² + 6 - 4x²y² = -8x²y² + 6

Explicação passo a passo: