Question

preciso de uma ajudinhaaa ( - 7/30) + ( + 4/30) + ( - 11/30) = (- 4,1) + ( -15,2) = ( +⅔ ) + ( -⅛) = ( - ⅕) - ( + ⅔) - ( -¼) =

Answer 1

Explicação passo-a-passo:

a) $\sf \left(-\dfrac{7}{30}\right)+\left(+\dfrac{4}{30}\right)+\left(-\dfrac{11}{30}\right)$

$\sf =\dfrac{-7}{30}+\dfrac{4}{30}-\dfrac{11}{30}$

$\sf =\dfrac{-7+4-11}{30}$

$\sf =\dfrac{-14}{30}$

b) $\sf (-4,1)+(-15,2)$

$\sf =-4,1-15,2$

$\sf =-19,3$

c) $\sf \left(+\dfrac{2}{3}\right)+\left(-\dfrac{1}{8}\right)$

$\sf =\dfrac{2}{3}-\dfrac{1}{8}$

$\sf mmc(3,8)=24$

$\sf =\dfrac{2\cdot8-1\cdot3}{24}$

$\sf =\dfrac{16-3}{24}$

$\sf =\dfrac{13}{24}$

d) $\sf \left(-\dfrac{1}{5}\right)-\left(+\dfrac{2}{3}\right)-\left(-\dfrac{1}{4}\right)$

$\sf =\dfrac{-1}{5}-\dfrac{2}{3}+\dfrac{1}{4}$

$\sf mmc(3,4,5)=60$

$\sf =\dfrac{-1\cdot12-2\cdot20+1\cdot15}{60}$

$\sf =\dfrac{-12-40+15}{60}$

$\sf =\dfrac{-37}{60}$