Question

efetue as adiçoes : a) (+3/5) + (+1/2 b) (-2/3) + (+5/4)
c) (-4/9) - (+5/4) d) (-3/7) - (-2/9

Answer 1

a)

$\mathsf{\dfrac{3}{5}+\dfrac{1}{2}=\dfrac{6+5}{10}=\dfrac{11}{10}}$

b)

$\mathsf{-\dfrac{2}{3}+\dfrac{5}{4}=\dfrac{-8+15}{12}=\dfrac{7}{12}}$

c)

$\mathsf{-\dfrac{4}{9}-\dfrac{5}{4}=\dfrac{-16-45}{36}=-\dfrac{61}{36}}$

d)

$\mathsf{-\dfrac{3}{7}+\dfrac{2}{9}=\dfrac{-27+14}{63}=-\dfrac{13}{63}}$