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e) 18:[(5^2 – 5. x)·2-11]=2​

Răspuns :

Răspuns:

e)18:[(5²-5x)×2-11]=2

18:[(25-5x)×2-11]=2

18:(50-10x-11)=2

18:(39-10x)=2

18/(39-10x)=2

18=2(39-10x)

9=39-10x

10x=39-9

10x=30

x=30:10

x=3