Răspunsuri

2014-11-08T20:03:37+02:00
(a:7)+11=15 | -11
a:7=4
a=7x4
a=28
20 4 20
a:7=b b+11=15 => b=15-11 => b=4 => a:7=4=> a=4x7 => a=28
2014-11-08T20:04:58+02:00