[21-(17x6-816:8)x3]:7
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Răspuns :

[21-(17×6-816:8)×3]:7=3

17×6=102

816:8=102

102-102=0

0×3=0

21-0=21

21:7=3

[21-(17x6-816:8)x3]:7 =

[21 -(102 - 102) x 3] : 7 =

[21 - 0 x 3] : 7 =

[21  - 0] : 7 =

21 : 7 =

3