Răspunsuri

2014-04-24T19:09:40+03:00
S=suma initiala
4S=380+2/3S
4S=(1140+2S)/3
12S=1140+2S
10S=1140
S=1140/10
S=114
2014-04-24T19:18:00+03:00
4a = 2/3 a + 380
4a - 2/3 a = 380 (aducem la numitorul comun 3,amplificand prima fractie cu 3)
12a/3 - 2/3 a = 380
10a/3 = 380
a = 114