привет ребят , помогите решить задачи , у нас с-р помогите

694. а) 3n-n(4n-6m) =3n -4n +6mn =6mn -n =n(6m -n)

b) 5a +2a(3a -2) =5a +6a -4a =6a +a =a(6a +1)

в) 5c^3 -3c(2c -1) =5c^3 - 6c^3 +3c =3c -c^3 = c(3 -c)
695. a) a(a+b) -b(a-b) = a +ab -ab +b =a +b

b) 2x(x-y) -y(y-2x) =2x -2xy -y +2xy =2x -y

в) a(a-1) +a(a-1) =a^3 -a +a^3 -a =2a^3 -a -a = a(2a -a -1)

г) 4m(m-2) -(4m -8) =4m -8m -4m+8 =8 -8m =8(1-m)

д) 2(x-7) +(7-2x) =2x -14 +7 -2x = -7

e) 3x(x-y) +3y(x+y) =3x -3xy +3xy +3y =3x +3y = 3(x +y)