Ответ:
[tex]9a^2-18a=9a(a-2)\\\\6(m+n)-k(m+n)=(m+n)(6-k)[/tex]
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Ответ:
[tex]9a^2-18a=9a(a-2)\\\\6(m+n)-k(m+n)=(m+n)(6-k)[/tex]