Question

Resolva as expressões algébricas:

a)b²+3b/b+3

b)x+z/3x+3z

Answer 1

$a) \frac{b(b+3)}{b+3} =b$
$\frac{x+x}{3(x+z)} = \frac{1}{3}$

Answer 2

Fator comum 

a) b²+3b  =  b(b + 3)  ==> b
    b+3             b + 3 ) 

b)   x+z =   (x + z ) ==>  1
    3x+3z    3( x + z)        3