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b) 1/5-1/4= 4/20- 5/20= - 1/20
c) 3/7+2/9= 27/63+14/63= 41/63
d) 4/7-1/6= 24/54- 7/54= 17/54
e) 3/7+ 1/4= 12/28+ 4/28= 16/28= 2/7
f) 1/2-3/9= 9/18- 6/18= 3/18= 1/6
g) 1/8+1/5= 5/40+ 8/40= 13/40
h) 3/4-2/3= 9/12- 8/12= 1/12
i) 7/8-1/3= 21/24- 7/24= 14/24= 7/12
zad. 2
f) 5/7+2/3= 15/21+ 10/21= 25/21= 1 cała 4/21
g) 4/5+4/6= 24/30+ 20/30= 44/30= 1 cała 14/30
h)4/7-1/2= 8/14- 7/14= 1/14
i) 2/3-2/5= 10/15- 6/15= 4/15