Bài 8. Hệ phương trình mũ và lôgarit
\(a)\,\left\{ \matrix{ {3.2^x} + {2.3^y} = 2,75 \hfill \cr {2^x} – {3^y} = – 0,75\,; \hfill \cr} \right.\)
\(a)\,\left( {{1 \over 3}} \right) ^x= x + 4\,;\)
\(a)\,{2^{{{\sin }^2}x}} + {4.2^{{{\cos }^2}x}} = 6\,;\)
\(\eqalign{ & a)\,{4^{ – {1 \over x}}} + {6^{ – {1 \over x}}} = {9^{ – {1 \over x}}}; \cr & c)\,3\sqrt {{{\log }_2}x} – {\log _2}8x +
\(a)\,\,\left\{ \matrix{ {3^{ – x}}{.2^y} = 1152 \hfill \cr {\log _{\sqrt 5 }}\left( {x + y} \right) = 2; \hfill \cr} \right.\)
\(a)\,\left\{ \matrix{ x + y = 20 \hfill \cr {\log _4}x + {\log _4}y = 1 + {\log _4}9; \hfill \cr} \right.\)