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(b+c)•a=50
(b-c)•a=10
a= 5


(b+c)•a=72
a=8


Răspuns :

5(b+c)=50
b+c=50:5=10

5(b-c)=10
b-c=10:5=2

8(b+c)=72
b+c=72:8=9
(b+c)·5=50   b+c=50:5  b+c=10
(b+c)·8=72  b+c=72:8   b+c=9