Răspunsuri

2014-11-19T17:01:48+02:00
Notam cu x nr . 
(X *2 +15) *3 =17
×*2 +15=17:3
×*2+15=5,(6)
×*2=5,(6)-15
×*2 =-9,(3)
×=-9,(3):2
×-4,(6)