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5_5_5_5_5=1
5_5_5_5_5=5
5_5_5_5_5=10

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Răspuns :

5-[(5x5-5):5]=5-[(25-5):5]=5-(20:5)=5-4=1
5-5+5-5+5=0+5-5+5=5-5+5=0+5=5
5x5-(5+5+5)=25-15=10