Ответ:
3. 5х2 - 5ах-7а+7х=5х2-5ах+7х-7а
=5х(х-а)+7(х-а)=(х-а)(5х+7)
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Ответ:
3. 5х2 - 5ах-7а+7х=5х2-5ах+7х-7а
=5х(х-а)+7(х-а)=(х-а)(5х+7)