Răspunsuri

2014-11-09T21:19:02+02:00
A) 5x=8⇔ x= \frac{8}{5}
b) -5x=-3+(-2²)⇔-5x=-3+4⇔ -5x=1⇔ x= \frac{1}{-5}
c) x(9-4)=7+2⇔5x=9⇔ x= \frac{9}{5}
d) 17x-4x=6-(-20)⇔13x=6+20⇔13x=26/:13 ⇔x=2
 Si proba e simplu de facut, inlocuiesti x in fiecare ecuatie