Question

me ajudem por favor!​

Answer 1

Explicação passo-a-passo:

$\sf \dfrac{11!+9!}{10!}$

$\sf =\dfrac{11\cdot10\cdot9!+1\cdot9!}{10\cdot9!}$

$\sf =\dfrac{(11\cdot10+1)\cdot9!}{10\cdot9!}$

$\sf =\dfrac{(110+1)\cdot9!}{10\cdot9!}$

$\sf =\dfrac{111\cdot9!}{10\cdot9!}$

$\sf =\red{\dfrac{111}{10}}$

Letra C