Укажите верное тождество:
А.
[tex] \frac{5a}{a {}^{2 } - 3} = \frac{5}{a - 3} [/tex]
С.
[tex] \frac{b}{b - 3} = \frac{7b}{21 - 7b} [/tex]
В.
[tex] \frac{x + y}{x - y} = \frac{(x + y) {}^{2} }{x {}^{2} - y {}^{2} } [/tex]
Д.
[tex] \frac{5}{11} = \frac{5}{11n} [/tex]

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