а) 4/7 + 2/7 =6/7
б) 1/9+6/9=7/9
в)13/19+5/19 =18/19
г)13/100+26/100=39/100
д)7/9-2/9=5/9
е)4/5-3/5=1/5
ж)13/17-4/17=9/17
з)37/100-16/100 =21/100
а) 4/7 + 2/7 =6/7
б) 1/9+6/9=7/9
в)13/19+5/19 =18/19
г)13/100+26/100=39/100
д)7/9-2/9=5/9
е)4/5-3/5=1/5
ж)13/17-4/17=9/17
з)37/100-16/100 =21/100
в) 13/19+5/19 = 18/19
г) 13/100+26/100 = 39/100
д) 7/9-2/9 = 5/9
е) 4/5-3/5 = 1/5
ж) 13/17-4/17 = 9/17
з) 37/100-16/100 = 21/100