1)(5/30+3/30+2/30):(5/30+3/30-2/30)*2.52=(10/30)*(30/6)*2.52=(10/6)*(252/100)=
=252/6=42
2)(150/300-100/300+75/300-60/300):(75/300-50/300)*7/13=(115/300)*(300/25)*7/13=
=(23/5)*(7/13)=161/65
======
1)(5/30+3/30+2/30):(5/30+3/30-2/30)*2.52=(10/30)*(30/6)*2.52=(10/6)*(252/100)=
=252/6=42
2)(150/300-100/300+75/300-60/300):(75/300-50/300)*7/13=(115/300)*(300/25)*7/13=
=(23/5)*(7/13)=161/65
======