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[21-(17*6-816:8)*3]:7

Răspuns :

Răspuns:

[21-(102-102)x3]:7

[21-(0x3)]:7

(21-0):7

21:7

3

[21-(17·6-816:8)·3]:7=

[21-(102-102)·3]:7=

(21-0·3):7=

(21-0):7=

21:7=

3