Question

calcule as frações e, se possível, simplifique o resultado C) 1/10 + 7/10 - 1/15

Answer 1

Explicação passo-a-passo:

$\sf{\dfrac{1}{10} + \dfrac{7}{10} - \dfrac{1}{15}}$

$\sf{mmc(10,10,15) = 30}$

$\sf{\dfrac{30\div10\cdot1}{30} + \dfrac{30\div10\cdot7}{30} - \dfrac{30\div15\cdot1}{30}}$

$\sf{\dfrac{3}{30} + \dfrac{21}{30} - \dfrac{2}{30}}$

$\sf{\dfrac{3+21-2}{30}}$

$\sf{\dfrac{22}{30}}$

$\sf{\dfrac{22\div2}{30\div2}}$

$\boxed{\color{red}{\sf{=\dfrac{11}{15}}}}$