Resposta :
= - 2/9 + (-1/4)
= - 2/9 - 1/4
Mmc (9,4)= 36
= (-4.2 - 9)/36
= (-8 - 9)/36
= - 17/36
= - 2/9 - 1/4
Mmc (9,4)= 36
= (-4.2 - 9)/36
= (-8 - 9)/36
= - 17/36