Докажите тождества.
а) (m-2k)(m+k)=m^2-km-2k
б) b(b-4c)+5bc=b(b+c)
в) a(a+11)+a(a^2-11)=a^2(a+1)
г) (3-р)(р+2)-1=(р+8)(9-р)-67
Пожалуйста помогите прошу вас!
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