Tìm số tự nhiên \(x,\) biết: \(\left( {1,2 + 3,7} \right) < x < \left( {2,1 + 3,2} \right)\).

\(x > 7\)

\(x < 7\)

\(x < 5\)

\(x > 5\)

\(x = 6\)

\(x = 5\)

\(x = - 6\)

\(x = - 12\)

\(Q = \dfrac{{x + 3}}{{x + 5}}\)         

\(Q = \dfrac{{x - 3}}{{x - 5}}\)

\(Q = \dfrac{{x - 3}}{{x + 5}}\)

\(Q = \dfrac{{x + 3}}{{x - 5}}\)

\(A =  - \dfrac{1}{2}\)

\(A = \dfrac{1}{2}\)

\(A = \dfrac{1}{2};A =  - \dfrac{1}{2}\)

\(A =  - \dfrac{2}{3}\)

\(A =  - \dfrac{1}{2}\)

\(A = \dfrac{1}{2}\)

\(A = \dfrac{1}{2};A =  - \dfrac{1}{2}\)

\(A =  - \dfrac{2}{3}\)

\(1,2\)

\(1,4\)

\(1,5\)

\(1,8\)

\(D = \left\{ 6 \right\}\)

\(D = \left\{ {2;4;6;7} \right\}\)

\(D = \left\{ {2;4} \right\}\)

\(D = \left\{ {6;7} \right\}\)