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r+s=40,s=r+10,r=?,s=?

Răspuns :

s=r+10

r+s=40
r+r+10=40
2r=40-10
r=30:2=15
s=15+10=25
inlocui in prima ecuatie:
r+r+10=40
2r=40-10
2r=30
r=15
=>s=r+10
s=15+10
s=25