Question

Rezolvati in Q ecuatiile,apoi faceti proba :
a) 5x=8
b) -5x=-3+(-2)la a doua
c) x(9-4)=7+2
d) 17x-4x=6-(-20)

Answer 1

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