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Afati x din urmatoarele ecuatii:
3(2x+5)-4=23
[15*(10x-11)-120]*10-25=125


Răspuns :

3(2x+5)-4=23
6x+15-4=23
6x+11=23
6x=23-11
6x=12
x=12:6
x=2
 

[15*(10x-11)-120]*10-25=125
(150x-165-120)*10-25=125
150x-45*10-25=125
150x-450-25=125
150x-425=125
150x=125+425
150x=550
x=550-150
x=400