Question

resolvam aí por favor​

Answer 1

1-Como os denominadores são iguais, vc pode simplesmente somar

Assim:

$\frac{5a+5b}{a+b} =\frac{5(a+b)}{a+b} =5$

2-

$\frac{1}{a(a+1)} +\frac{a-1}{a} =\\\\\frac{1+(a+1)(a-1)}{a(a+1)} =\\\\\frac{1+a^{2} -1}{a(a+1)} =\\\\\frac{a^{2} }{a(a+1)} =\\\\\frac{a}{a+1}$