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Stiind ca a/11=b/3,calculati 7a-2b/3a+5b

Răspuns :

b = 3a/11
(7a - 2b) /( 3a+5b) = (7a - 6a/11) / (3a + 15a/11) = 71a/11 ·11/48a = 71/48