9 Calculati, folosind factorul comun:
a 13.5+ 13.21 + 13.40; b437. 109 - 437.54 + 437. 203:
c49.135 - 49.27 +49.11;
d 2011.5 + 2011: 7 + 2011.49 + 2011.39:
e 2 + 4 + 6 + 8 + 10 + 12;
f13.17 + 13.25 - 42.11-2.41.​