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Dacă 2a/7b=1/3, calculati valoarea raportului 2a-b/a+2b
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Răspuns :

Uhaciioan
2a-b/a+2b2a/7b=1/3
7b=2a x 3 = 6a
b= 6a/7

2a-b= 2a - 6a/7 =14a/7 -6a/7 =8a/7

a+2b = a+ 2 x 6a/7 =7a/7+ 12a/7 =19a/7

2a-b/a+2b = 8a/7 : 19a/7 = 8a/7 x 7/19a =8/19