-1/5 - 0,5 + (-1/2)= -1/5 - 1/2 - 1/2 = -2/10 - 5/2 - 5/2 = -12/2 = -6
(-7+(-5)/-2):3 = (-7-5/-2):3=(-12/-2):3=6:3=2
19 - 3/4 * 6 2/7 = 19 - 3/4 *44/7 (po przekątnych skracamy przez 4) = =19 - 3/1* 11/7 = 19 - 33/7 = 133/7 - 33/7 = 100/7 = 14 2/7
(4 1/3 - 2 1/6) : 1 5/8 = (13/3 - 13/6): 13/8 = (26/6 - 13/6) : 13/8 = 13/6 : 13/8 = =13/6 * 8/13 (skracamy po przekątnych przez 13 ) = 1/6*8/1 = 8/6 = 4/3 = 1 1/3
4: (-2 1/2) - (-14/15) = 4 : (-5/2) + 14/15 = 4 * (-2/5) + 14/15 = -8/5 + 14/15 = =-24/15 + + 14/15 = - 10/15 = -2/3
