Tập nghiệm của hệ phương trình \(\left\{ \begin{array}{l}{2^x} + {5^{x + y}} = 7\\{2^{x - 1}}{.5^{x + y}} = 5\end{array} \right.\) là :
A.\(\left\{ {\left( {1;0} \right),\left( {{{\log }_2}5;{{\log }_5}2 - {{\log }_2}5} \right)} \right\}\)
B.\(\left\{ {\left( {1;0} \right),\left( {{{\log }_5}2;{{\log }_5}2 + {{\log }_2}5} \right)} \right\}\)
C.\(\left\{ {\left( {2;1} \right),\left( {{{\log }_2}5;{{\log }_5}2 - {{\log }_2}5} \right)} \right\}\)
D.\(\left\{ {\left( {1;0} \right),\left( {{{\log }_2}5;{{\log }_2}5 - {{\log }_5}2} \right)} \right\}\)
A.\(\left\{ {\left( {1;0} \right),\left( {{{\log }_2}5;{{\log }_5}2 - {{\log }_2}5} \right)} \right\}\)
B.\(\left\{ {\left( {1;0} \right),\left( {{{\log }_5}2;{{\log }_5}2 + {{\log }_2}5} \right)} \right\}\)
C.\(\left\{ {\left( {2;1} \right),\left( {{{\log }_2}5;{{\log }_5}2 - {{\log }_2}5} \right)} \right\}\)
D.\(\left\{ {\left( {1;0} \right),\left( {{{\log }_2}5;{{\log }_2}5 - {{\log }_5}2} \right)} \right\}\)
Loga
Hóa Học lớp 12
