Răspunsuri

2014-04-27T08:55:07+03:00
A- numarul

5a-70=a/3 - amplif cu 3 pt a avea ac. numitor
15a-210=a
15a-a=210
14a=210
a=210:14
a=15

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2014-04-27T08:57:48+03:00
A x 5 - 70 = 1/3 a
5a - 70 = 1/3a
5a - 1/3 a = 70 (aducem la numitorul comun 3,amplificand primul termen cu 3)
15a/3 - 1/3 a = 70
14/3 a = 70
a = 15
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