Răspunsuri

2014-10-26T21:03:37+02:00
2014-10-26T21:07:06+02:00
Numarul este a
a+2a+ \frac{a}{2} =42
aducem la acelasi numitor si ne da
 \frac{2a}{2} +  \frac{4a}{2} +  \frac{a}{2} = \frac{84}{2}
2a+4a+a=84
7a=84
a= \frac{84}{7}
a=12