2(甲+乙+丙)
=甲+乙 + ( 丙+乙 )+ (丙+甲)
=37+56+49
=142
甲+乙+丙=71
丙=甲+乙+丙 -(甲+乙)=71-37=34
甲=甲+乙+丙 -(丙+乙)=71-56=15
乙=甲+乙+丙 -(丙+甲)=71-49=22
2(甲+乙+丙)
=甲+乙 + ( 丙+乙 )+ (丙+甲)
=37+56+49
=142
甲+乙+丙=71
丙=甲+乙+丙 -(甲+乙)=71-37=34
甲=甲+乙+丙 -(丙+乙)=71-56=15
乙=甲+乙+丙 -(丙+甲)=71-49=22