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a+b=7,21 iar a-b=2,17 care sunt numerele

Răspuns :

a=b+2.17
a+b=7.21<=>2b+2.17=7.21=>
2b=5.04=>b=2.52=>
a=2.52+2.17=4.69
7,21-2,17=5.04/2=2.52
I nr. 2.52+2.17=4.69
II nr. 7.21-4.69=2.52