5/3 + (-2/7) - (-1,2)
=5/3 + (-2/7) - (-12/10)
=5/3 + (-2/7) - (-6/5)
= 35/21 + (-6/21) -(-6/5)
= 29/21 - (-6/5)
= 29/21 + 6/5
= 145/105 + 126/105
= 271/105
a)
=\(\frac{29}{21}\)- (- 1,2)
=\(\frac{271}{105}\)
b)
=\(\frac{-23}{28}\)- \(\frac{17}{4}\)
= \(\frac{-199}{36}\)