Răspunsuri

2014-11-13T16:01:31+02:00
2014-11-13T16:04:27+02:00
(x+139)-4*5=167
x+139)-20=167
notam(x+139) cu a
a-20=167
a=167+20
a=187
x+139=187
x=187-139
x=48