Răspuns :
a+b=27,8
a-b=1,2===> a=b+1,2
b+b+1.2=27,8
2b+1.2=27.8/-1.2
2b=26.6/:2
b=13.3
a=14.5
a-b=1,2===> a=b+1,2
b+b+1.2=27,8
2b+1.2=27.8/-1.2
2b=26.6/:2
b=13.3
a=14.5