Răspuns :
Răspuns:
folosim metoda inversă
Explicație pas cu pas:
[5•(5x-5)-120]•5= 125+25
= 150
5•(5x-5)-120=150:5
=30
5•(5x-5)=30+120
=150
5x-5=150:3
=30
5x= 30+5
=35
x= 35:5
x= 7
Răspuns:
b) [5*(5x-5)-120]*5-25=125
(25x-25-120)*5-25=125
(25x-145)*5-25=125
125x-725-25=125
125x-750=125
125x=125+750
125x=875
x=875:125
x=7.
Xenon54