Выберите пары подобных одночленов.
\(5x^2y\) и \(-2xyx\)
\(x^2yx^2\) и \(6x^2y\)
\(-7a^2b^2a^3\) и \(-2ab^2a^4\)
\(6mn\) и \(6m^2n\)
\(3mn^5kn\) и \(-2nmn^3kn\)
\(c^2d\) и \(d^2c\)