Question

Pfv quanto é (-45)+(10), e (9-)/(+3) Ajuda rapido de ultima hora

Answer 1

$\large\boxed{\begin{array}{l}\underline{\rm Regra\,de\,sinais\,para\,adic_{\!\!,}\tilde ao\,alg\acute ebrica}\\\sf sinais~iguais: soma\,e\,repete\,o\,sinal\\\sf sinais\,diferentes:diminui\,e\,d\acute a\,o\,sinal\\\sf de\,quem\,tiver\,maior\,m\acute odulo\\\underline{\rm Regra\,de\,sinais\,para\,multiplicac_{\!\!,}\tilde ao\,e\,divis\tilde ao}\\\sf sinais~iguais:~resultado\,positivo\\\sf sinais\,diferentes:resultado\,negativo\end{array}}$

$\large\boxed{\begin{array}{l}\sf -45+10~\acute e~uma~adic_{\!\!,}\tilde ao\,alg\acute ebrica.\\\sf portanto~iremos\,diminuir\\\sf e~d\acute a\,o\,sinal\,de\,quem\,tiver\,maior\,m\acute odulo.\\\sf -45+10=-35\end{array}}$

$\large\boxed{\begin{array}{l}\sf\dfrac{-9}{+3}~trata-se~de~divis\tilde ao.\\\\\sf o~resultado~final~dever\acute a\,ser\,negativo\\\sf \dfrac{-9}{+3}=-3\end{array}}$