Question

Gente!!! 15pontos, me ajudem por favor e pra agora!!!!!

Answer 1

Explicação passo-a-passo:

$a)~~+{1\over9}-{2\over9}={+1-2\over9}=-{1\over9}\\ \\ b)~~-9,6+2,5=-7,1\\ \\ c)~~-{7\over30}+{4\over30}-{11\over30}={-7+4-11\over30}={-18+4\over30}=-{14\over30}=-{7\over15}\\ \\ d)~~-4,1-15,2=-19,3\\ \\ e)\\ {2\over3}-{1\over8}=\\ \\ mmc(3,8)=24\\ \\ {16-3\over24}={13\over24}$

$f)\\ -{1\over5}-{2\over3}+{1\over4}=\\ \\ mmc(5,3,4)=60\\ \\ {-12-40+15\over60}={-52+15\over60}=-{37\over60}$