Iftimemarius18ask
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b=[tex] \frac{4}{5} [/tex]·(27-b)=?

Răspuns :

NiceRouchyask
[tex]b= \frac{4}{5} *(27-b) \\ ^{5)} {b} = \frac{108-4b}{5} |*5 \\ 5b = 108-4b| +4b \\ 9b = 108 | :9 \\ b = 12[/tex]

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