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