Question

sabendo que m=3-2n e n=-2÷3 verifique se são racionais os números
a) -m+n
b) m+n-13÷4

Answer 1

a) $-(3-2\cdot\dfrac{-2}{3})+\dfrac{-2}{3}\Rightarrow-(3+\dfrac{4}{3})+\dfrac{-2}{3}\Rightarrow -3-\dfrac{4}{3}-\dfrac{2}{3}=-\dfrac{15}{3}=-5$ (Racional)

b) $[tex]3+\dfrac{4}{3}-\dfrac{2}{3}-\dfrac{13}{4}=\dfrac{11}{3}-\dfrac{13}{4}=\dfrac{44-39}{12}=\dfrac{5}{12}$[/tex] (Não racional)