a) \(\frac{21}{47}\) + \(\frac{9}{45}\) + \(\frac{26}{47}\) + \(\frac{4}{5}\)
b) 12 x \(\left(-\frac{2}{3}\right)\)2 +\(\frac{4}{3}\)
c) 12,5 x \(\left(-\frac{5}{7}\right)\) + 1,5 x \(\left(-\frac{5}{7}\right)\)
d) \(\frac{4}{5}\) x \(\left(\frac{7}{2}+\frac{1}{4}\right)\)2