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Zad.1 Oblicz sprytnie :
a) 2 2/3 + 2 4/5 + 1/3
b) 7/9 + 1 3/4 +1/4
c)2 5/7 + 7 2/5 + 2 2/7 + 3 3/5
d) 2 3/4 + 1 1/6 + 4 5/6 + 1 2/4
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a)2 10/15+2 12/15+5/15=5 12/15=5 4/5
b)28/36+1 27/36+9/36=64/36=1 1/2
c)2 25/35+7 14/35+2 10/35+3 21/35=14 70/35=16
d)2 9/12+1 2/12+ 4 10/12+ 1 6/12=8 27/12=10 3/12=10 1/4