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2/3+4/7=14/21+12/21=26/21=1cała 5/21
5/6+7/9=15/18+14/18=29/18=1 cała 11/18
b) 2 3/4=1/6=11/4+1/6=33/12+2/12=35/12=2 całe 11/12
8/9+2 7/10=8/9+27/10=80/90+243/90=323/90=3 53/90
7/15+2 9/10 =7/15+29/10=14/30+87/30=101/30=3 11/30
c)3/4-3/5=15/20-12/20=3/20
7/8-2/5=35/40-16/40=19/40
1 5/6-3/4=11/6-3/4=44/24-18/24=26/24=1 1/12
d)4 5/9-1 1/2=41/9-3/2=82/18-27/18=55/18=3 1/18
1/6-2 4/5=1/6-14/5=5/30-84/30=-79/30= - 2 19/30
1/4-1 1/6=1/4-7/6=3/12-14/12= - 11/12
3/4-1 7/10=3/4-17/10=15/20-34/20= - 19/20