Question

Calcule:
a) (3a^2 - 5ab + 2c - 2bc) - (5a^2 - 5ab - 2bc)

b) (x/2 - 3xy/4 + y/3) - (3y/2 - xy/3 - 2x)

Answer 1

a) 3a² - 5ab +2c - 2bc -5a² + 5ab + 2bc 
    -2a² +2c 

b) x/2 - 3xy/4 + y/3 - 3y/2 + xy/3 + 2x
    5/2 x - 5xy/12 - 7/6 y 

Answer 2

Boa noite Pedro

a) 

(3a^2 - 5ab + 2c - 2bc) - (5a^2 - 5ab - 2bc)

3a^2 - 5a^2 - 5ab + 5ab + 2c - 2bc + 2bc  = -2a^2 + 2c

b)

(x/2 - 3xy/4 + y/3) - (3y/2 - xy/3 - 2x)

x/2 + 2x - 3xy/4 + xy/3 + y/3 - 3y/2 = 5x/2 - 5xy/12 - 7y/6