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(111+222+......+666):111×21
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Răspuns :

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(111+222+......+666):111×21 = 111·(1+2+...6) :111·21 = (1+2+3+4+5+6)·21 = 21·21 =

= 21² = 441

Albatran

111(1+2+...+6):111*21

=(1+2+...6) *26*7/2*21=21*21=21²=441

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