3. Розкрити дужки: (a + b)(c – 7) = …
a) ac – 7b; б) ac + bc – 7b – 7 ; в) ac + bc – 7; г) ac – 7a + bc – 7b
a) ac – 7b; б) ac + bc – 7b – 7 ; в) ac + bc – 7; г) ac – 7a + bc – 7b
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Ответ:
Г ас - 7а + bc - 7b