ta có
\(\frac{57}{76}=\frac{108}{a}+48\)
\(\frac{57}{76}-48=\frac{108}{a}\)
\(-\frac{189}{4}=\frac{108}{a}\)
\(\Rightarrow a=-\frac{16}{7}\)
\(\frac{3}{4}=\frac{108}{a}+48\)
\(\frac{3}{4}-48=\frac{108}{a}\)
\(\frac{-189}{4}=\frac{108}{a}\)
\(\Rightarrow a=108\times4:\left(-189\right)\)
\(\Rightarrow a=\frac{-16}{7}\)
\(\frac{57}{76}=\frac{108}{a+48}\)
\(\Rightarrow76\cdot108=58\cdot\left(a+48\right)\)
\(\Leftrightarrow8208=58a+2784\)
\(\Leftrightarrow58a=8208-2784\)
\(\Leftrightarrow58a=5424\)
\(\Leftrightarrow a=\frac{5424}{58}\)
\(\Leftrightarrow a=\frac{2712}{29}\)
