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[12-9:3+(12-9):3] x 2 + 1 = 41​

Răspuns :

1. Calculați

[ 12 - 9 ÷ 3 + ( 12 - 9 ) ÷ 3 ] × 2 + 1 <=>

<=> ( 12 - 9 ÷ 3 + 3 ÷ 3 ) × 2 + 1 <=>

<=> ( 12 - 3 + 1 ) × 2 + 1 <=>

<=> ( 9 + 1 ) × 2 + 1 <=>

<=> 10 × 2 + 1 <=>

<=> 20 + 1 <=>

<=> 21

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