найдите значение выражения 2/3+1/5= б 3/81/6+5/12= в3/14 +2/21-9/35= г 3/10 +1/8-2/5

1/2+5/8=4/8+5/8= 9/8,

3/4-1/2= 3/4-2/4= 1/4,

7/10-3/5=7/10-6/10=1/10,

5/7-3/14=10/14-3/14=7/14=1/2 ,

5/9-5/12= 20/36-5/36=15/36= 5/12 ,

7/12-7/20=35/60-21/60=14/60= 7/30 ,

5/6+3/8= 20/24+9/24= 29/24,

19/21-11/15= 95/105- 77/105= 18/105= 6/35,

21/22-3/55= 105/110- 6/110= 99/110= 9/10