Răspunsuri

2014-04-03T22:35:31+03:00
A+b+c+d=67     x_este nr.care se scade
9=a-x⇒a=9+x
b=15+x
c=11+x
d=12+x
inlocuim in prima relatie
9+x+15+x+11+x+12+x=67
4x+47=67
4x=67-47
x=20/5=4
a=9+x=9+5=14
b=15+5=20
c=11+5=16
d=12+5=17
verificare
14+20+16+17=67
2014-04-03T22:42:26+03:00
A+b+c+d=67 9=a-x⇒a=9+x b=15+x c=11+x d=12+x 9+x+15+x+11+x+12+x=67 4x+47=67 4x=67-47 x=20/5=4 a=9+x=9+5=14 b=15+5=20 c=11+5=16 d=12+5=17 verificare 14+20+16+17=67