1) 3a-15b=3(a-5b)
2) <span>5x-2xy= x(5-2y)
3) </span><span>7mn+7mk=7m(n+k)
4) </span><span>6a^2-12ab=6a(a-2b)
5) </span><span>x^8-x^3= x^3(x^5-1)</span>
17а +12b -14c -11a+10b+14c = 6a+22b
12a+11c-8-14a+5c=16c-2a-8
Пишу сразу разложение:8*a^3*(2*a^4+1)