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Stiind ca 5a-2b/7a+2b=1/2, aflati a/b.

Răspuns :

[tex] \frac{5a-2b}{7a+2b} [/tex]=[tex] \frac{1}{2} [/tex] =>
10a-4b=7a+2b
10a-7a=2b+4b
3a=6b
a=2b
[tex] \frac{a}{b}=2 [/tex]