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afla nr. ne cunostint 36-42:e:(15:3-4:1)-20= =10

Răspuns :

36-42:e:(15:3-4:1)-20=10
36-42:e:(5-4)-20=10
36-42:e:1-20=10
36-42:e-20=10
36-42:e=10+20
36-42:e=30
42:e=36-30
42:e=6
e=42:6
e=7

Acum verificam ...
36-42:7:(15:3-4:1)-20=10
36-42:7:(5-4)-20=10
36-42:7:1-20=10
36-42:7-20=10
36-6-20=10
30-20=10