Giải hệ phương trình sau: \(\left\{ \begin{array}{l}\frac{7}{{\sqrt {x + 7} }} - \frac{4}{{\sqrt {y - 6} }} = \frac{{ - 1}}{4}\\\frac{5}{{\sqrt {x + 7} }} + \frac{3}{{\sqrt {y - 6} }} = \frac{{11}}{4}\end{array} \right..\)
A.\(\left( {x;y} \right) = \left( {9;10} \right).\)
B.\(\left( {x;y} \right) = \left( {7;9} \right).\)
C.\(\left( {x;y} \right) = \left( {6;7} \right).\)
D.\(\left( {x;y} \right) = \left( {7;8} \right).\)
A.\(\left( {x;y} \right) = \left( {9;10} \right).\)
B.\(\left( {x;y} \right) = \left( {7;9} \right).\)
C.\(\left( {x;y} \right) = \left( {6;7} \right).\)
D.\(\left( {x;y} \right) = \left( {7;8} \right).\)
Loga
Hóa Học lớp 12
