Algebra 3ª media

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Ricorda la regola che: $\small +×+=+; -×- = +; +×- = -; -×+= -;

$\small \left(-\dfrac{3}{2}\right)+\left(-\dfrac{5}{4}\right)+\left(-\dfrac{1}{8}\right)+\left(+\dfrac{5}{12}\right) =$

$\small = -\dfrac{3}{2}-\dfrac{5}{4}-\dfrac{1}{8}+\dfrac{5}{12}=$

minimo comun denominatore = 24:

$\small = \dfrac{-36-30-3+10}{24}=$

$\small = -\dfrac{59}{24}$

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$\small \left(-\dfrac{7}{3}\right)+\left(-\dfrac{10}{3}\right)+\left(-\dfrac{1}{2}\right)+\left(+\dfrac{1}{6}\right) = $

$\small = -\dfrac{7}{3}-\dfrac{10}{3}-\dfrac{1}{2}+\dfrac{1}{6} =$

$\small = -\dfrac{17}{3}-\dfrac{1}{2}+\dfrac{1}{6} =$ (qui ho potuto operare con le prime due frazioni perché hanno lo stesso denominatore)

minimo comun denominatore = 6:

$\small = \dfrac{-34-3+1}{6} =$

$\small = -\dfrac{\cancel {36}^6}{\cancel 6_1} =$

$\small = -6$

mcm = 24

(-36-30-3+10)/24

-59/24

mcm = 6

(-14-20-3-1)/6

-36/6

-6