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a)2 i 1/5+3 i 7/10+1/2=2 i 2/10+3 i 7/10+5/10=5 i 14/10=6 i 4/10=6 i 2/5
b) tutaj coś Ci umknęło 4 i 13/24+2 5/...
c)5 i 5/8+3 i 1/2+1 i 3/4=5 i 5/8+3 i 4/8+1 i 6/8=9 i 15/8=10 i 7/8
odejmowanie:
a)17/20-3/5=17/20-12/20=5/20=1/4
b)7/8-3/16=14/16-3/16=11/16
c)3 i 5/6-1 i 1/3=3 i 5/6-1 i 2/6=2 i 3/6=2 i 1/2
d)6 i 3/5-2 i 3/4=6 i 12/20-2 i 15/20=5 i 32/20-2 i 15/20=3 i 17/20