Răspunsuri

2014-07-03T09:54:55+03:00
2a + 4b = 18
2(a + 2b) = 18
a + 2b = 18 ÷ 2
a + 2b = 9
2014-07-03T10:10:39+03:00
2a+4b=18   / :2   Adica impartim toate ecuatia la 2
a+2b=9 . Exact ce iti trebuia tie
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