Zad 6 1 a+b=4/5+5/6=24/30+25/30=49/30=1 i 19/30 a-b= 4/5-5/6=24/30-25/30= -1/30 2 a+b= 2/7 + b=7/9 2/7 + x=7/9 b= 7/9-2/7=49/63-18/63=31/63 a-b=2/7-31/63=18/63-31/63= -13/63 3 a+b=10 i 3/4+ 7 i 1/3 =10 i 9/12 + 7 i 4/12=18 i 1/12 a-b=10 i 3/4- 7 i 1/3 =10 i 9/12 - 7 i 4/12=3 i 5/12 4 a-b=6 i 7/12- b =3 i 3/7 6 i 7/12- b =3 i 3/7 -b=3 i 3/7 - 6 i 7/12=3 i 36/84 - 6 i 49/84= - 3 i 13/84 b=3 i 13/84 a+b=6 i 7/12 + 3 i 13/84=6 i 49/84 + 3 i 13/84= 9 i 62/84 = 9 i 31/42 5 a-b= 3 i 3/4 - b=1 i 1/5 3 i 3/4 - b=1 i 1/5 -b=1 i 1/5 - 3 i 3/4=1 i 4/20 - 3 i 15/20= - 2 i 11/20 b= 2 i 11/20 a+b= 3 i 3/4 + 2 i 11/20 = 3 i 15/20 + 2 i 11/20 = 6 i 6/20= 6 i 3/10 Zad 6 1 a*b=4/3*5/6=20/18=10/9 =1 i 1/9 2 a*b=4/7*3/4=12/28=6/14=3/7 3 a*b=3/11*7 i 1/3=3/11* 22/3-=6/3=2 4 a*b=7/12*3 i 3/7=7/12*24/7=14/7=2 5 a*b=1 i 3/4*3 i 1/5=7/4*16/5=28/5=5 i 3/5
