Сократите полученную дробь,если это возможно! 17\150 +13/150 ; 78/150+28/150; 52/270+38/270; 157/270-97/270. 123/350-53/350; 39/350+11/350; 107/420+103/420; 287\420-117/420.

1) ( 17/150 ) + ( 13/150 ) = 30/150 = 1/5
2) ( 78/150 ) + ( 28/150 ) = 106/150 = 53/75 
3) ( 52/270 ) + ( 38/270 ) = 90/270 = 1/3 
4) ( 157/270 ) - ( 97/270 ) = 60/270 = 2/9 
5) ( 123/350 ) - ( 53/350 ) = 70/350 = 1/5 
6) ( 39/350 ) + ( 11/350 ) = 50/350 = 1/7 
7) ( 107/420 ) + ( 103/420 ) = 210/420 = 1/2 
8) ( 287/420 ) - ( 117/420 ) = 170/420 = 17/42