Răspunsuri

2014-05-10T17:26:33+03:00
2n+n/4 =n+25  aducem la acelasi numitor
8n+n=4n+100
9n=4n+100
9n-4n=100
5n=100
n=20
2014-05-10T17:30:22+03:00
2n+1/4n=25+n /-n
2n-n+1/4n=25
n+1/4n=25 amplifivam primul n cu 4
4n/4+1/4n=25
5n/4=25 rezulta ca n = 4/5nx 25(simplificam ce se poate) n=20