а) a+b × c+b × d = a+b × (c+d) б) a + b × c + b × d = a - b × (-c-d) в) a - b × c + b × d = a + b × (-c+d) г) a - b × c + b × d = a - b × (c-d) д) a + b × c - b × d = a + b × (c-d) е) a + b × c - b × d = a - b × (-c+d) ж) a - b × c - b × d = a + b × (-c-d) з) a - b × c - b × d = a - b × (c+d)
б) a + b × c + b × d = a - b × (-c-d)
в) a - b × c + b × d = a + b × (-c+d)
г) a - b × c + b × d = a - b × (c-d)
д) a + b × c - b × d = a + b × (c-d)
е) a + b × c - b × d = a - b × (-c+d)
ж) a - b × c - b × d = a + b × (-c-d)
з) a - b × c - b × d = a - b × (c+d)