Bài 8. Phương trình mũ và lôgarit
a) \(\left\{ \matrix{9{x^2} – 4{y^2} = 5 \hfill \cr{\log _5}\left( {3x + 2y} \right) – {\log _3}\left( {3x – 2y} \right) = 1 \hfill \cr} \right.\)
a ) \(\left\{ \matrix{ {4^{{{\log }_3}xy}} = 2 + {\left( {xy} \right)^{{{\log }_3}2}} \hfill \cr {x^2} + {y^2} – 3x – 3y = 12 \hfill \cr} \right.\)
a )\(\left\{ \matrix{{\log ^2}x = {\log ^2}y + {\log ^2}xy \hfill \cr{\log ^2}\left( {x – y} \right) + \log x\log y = 0 \hfill \cr} \right.\)
a)\(\left\{ \matrix{{2^x} + {5^{x + y}} = 7 \hfill \cr {2^{x – 1}}{.5^{x + y}} = 5 \hfill \cr} \right.\)
a)\(\left\{ \matrix{{3^x}{.2^y} = 972 \hfill \cr{\log _{\sqrt 3 }}(x – y) = 2; \hfill \cr} \right.\)
a)\(\left\{ \matrix{ x + y = 11 \hfill \cr{\log _2}x + {\log _2}y = 1 + {\log _2}15 \hfill \cr} \right.\) b) \(\left\{ \matrix