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;
e2+ 4 + 6 + 8 + 10 + 12;
113.17 + 13.25 - 42.11 - 2.41.​