Ответ:
Объяснение:
1)
(14m^4c)/n^6 *n^5/35mc^6=14m³n / 35c
2)
36x³/y² : 9x^6y = 36x³/y² *1/9x^6y= 4/x³y³
3)
(8m-8n)/a^5 *5a^10/(m²-n²)= 8(m+n)/a^5 * 5a^10/(m-n)(m+n)=
=40a^5/(m-n)
4)
(3x-15)/(x+4) : (x²-25)/(3x+12) = 3(x-5)/(x+4) * 3(x+4)/(x-5)(x+5)=
=9/(x+5)