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2+[9-(8+a×6÷10]×4=30



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Răspuns :

Răspuns:

a=2

[tex]2+[9-(8+a×6)÷10]×4=30 \\ [9-(8+a×6)÷10]×4=28 \\ \\ 9-(8+a×6)÷10=7 \\ 90 - (8 + 6a) = 70 \\ 90 - 8 - 6a = 70 \\ 6a = 82 - 70 \\ 6a = 12 \\ a = 2[/tex]