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necunoscut:
5+5: {[5+5 (z-5)]:5-5) = 10.​


Răspuns :

Răspuns:

5+5: {[5+5 (z-5)]:5-5} = 10

5: {[5+5 (z-5)]:5-5} =5

[5+5 (z-5)]:5-5 =25

[5+5 (z-5)]:5 =30

5+5 (z-5) =150

5 (z-5) =145

z-5=29

z=34