Question

Urgente!! a) (3+ab-a²b-ab²)-(-ab+b²-7a²b+4ab²)= b) -(xy+x-y)-(4x+xy-y²)= c) (-2dr²+16r²-5d)+(-7d-15dr²+r ²)= d) (3x+3y -5z)-(-5y+2z-7x)=

Answer 1

a) (3+ab-a²b-ab²)-(-ab+b²-7a²b+4ab²)=
     3+ab-a²b-ab²+ab-b²+7a²b-4ab²
    3 + 2ab + 6a²b - 5ab² - b²

b) -(xy+x-y)-(4x+xy-y²)=
    - xy - x + y - 4x - xy + y² 
    - 2xy - 5x + y + y²

c) (-2dr²+16r²-5d)+(-7d-15dr²+r ²)=
     -2dr² + 16r² - 5d - 7d - 15dr² + r ²
     - 17dr² + 17r² - 12d 
       

d) (3x+3y -5z)-(-5y+2z-7x)=
    3x + 3y - 5z + 5y - 2z + 7x
    10x + 8y - 7z