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aflati valoarea nr a [(a×3)×2]÷4÷3 =21

Răspuns :

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[tex][(3*a)*2)]:\frac43=21 \\ \\6a*\frac34=21 \\ \\ \frac{18a}{4}=21 \\ \\ \frac{9a}{2}=21 \\ \\ 9a=41 \\ \\ a=\frac{41}{9}[/tex]
[(a×3)×2]:4:3=21
[(a×3)×2]:4=21×3
[(a×3)×2]:4=63
(a×3)×2=63×4
(a×3)×2=252
a×3=252:2
a×3=126
a=126:3
a=42