Question

O valor da expressao a+b para a= ⅓ e b = ⅖ e?

Answer 1

$a+b=\dfrac{1}{3}+\dfrac{2}{5}.$

mmc(3,5) = 15.

$\therefore$

$a+b=\dfrac{15\div3\cdot1}{15}+\dfrac{15\div5\cdot2}{15}\implies$

$\implies a+b=\dfrac{5\cdot1}{15}+\dfrac{3\cdot2}{15}\implies$

$\implies a+b=\dfrac{5}{15}+\dfrac{6}{15}\implies$

$\implies a+b=\dfrac{5+6}{15}\implies$

$\implies \underline{\boxed{a+b=\dfrac{11}{15}}}\,.$