Oblicz ułamki :
a) 1/2 - 3/4 + 5/6 =
b) 1/3 + 3/2 - 5/6 =
c) 2/5 - 5/7 - 7/10 =
d) -2/13 + 2/3 + 7/39 =
e) 5/3 - 9/8 - 13/12 =
f) - 2 1/3 + 9/8 + 17/12 =
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a) 1/2 - 3/4 + 5/6 =6/12+10/12-9/12=16/12-9/12=7/12
b) 1/3 + 3/2 - 5/6 =2/6+9/6-5/6=11/6-5/6=6/6=1
c) 2/5 - 5/7 - 7/10 = 28/70-50/70-49/70=-71/70=- 1 i 1/70
d) -2/13 + 2/3 + 7/39 =-6/39+26/39+7/39=33/39-6/39=27/39=9/13
e) 5/3 - 9/8 - 13/12 = 40/24-27/24-26/24=-13/24
f) - 2 1/3 + 9/8 + 17/12 = -7/3+9/8+17/12=-56/24+27/24+34/24=61/24-56/24=5/24