Question

A expressão algébrica 4x+xy/4y+y² - 42x²zy²/63zxy³ com x ≠0 , y ≠0 e z ≠0 equivale a :

Answer 1

$\frac{4x +xy}{4y +y^{2} } -\frac{42x^{2}zy^{2}}{63zxy^{3}} = \frac{x(4 +y)}{y(4+y)} - \frac{2x(21xzy^{2})}{3y(21xzy^{2})} = \frac{x}{y} -\frac{2x}{3y} = \frac{3x -2x}{3y} = \frac{x}{3y}$