Ответ:
х(3+ху)-у(3+ху)=(х-у)×(3+ху)
(х2-1)×(х2+1)=(х-1)×(х+1)×(х2+1)
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Ответ:
х(3+ху)-у(3+ху)=(х-у)×(3+ху)
(х2-1)×(х2+1)=(х-1)×(х+1)×(х2+1)