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Draguta1111111
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Calculeaza:[5•(5x-5)-120]•5-25=125!!! Aflal pe x!!!Va rog ajutatima cat mai repede posibil!!

Răspuns :

Darabancristian
[10x-25-120]*5-25=125
[10x-145]*5-25=125
50x-725-25=125
50x-750=125
50x=125+750
50x=875
x=875:50
x=17.5
[5•(5x-5)-120]•5-25=125   Aplicam metoda  mersului invers:
[5•(5x-5)-120]•5=125+25
5•(5x-5)-120=150:5
5•(5x-5)=30+120
(5x-5)=150:5
5x=30+5
x=35:5
x=7


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