Răspuns :
a+b=63.8
a-b=19.4 / + b
a=19.4+b
inlocuiesti : 19.4+b+b=63.8 / -19.4
b+b=44.4
2b=44.4/:2
b=22.2
a-b=19.4 / + b
a=19.4+b
inlocuiesti : 19.4+b+b=63.8 / -19.4
b+b=44.4
2b=44.4/:2
b=22.2
a+b=63,8
a-b=19,4=> a=19,4+b
2b+19,4=63,8=> 2b=44,4=> b=22,2; a=41,6