1.
1) 16a^4-4a^3+8a^2=4a(4a^3-a^2+2a)
2) 7(x-2)-х(х-2)=(x-2)(7-x)
3) 5a^2+10ab=5a(a+2b)
2.
1) 5a-ab+5c-bc=(5-b)*(c+a)
2) a^2-49=(a-7)*(a+7)
3) 2b^2-12bc+18c^2=2(3c-b)^2
3.
1) 2c(c-b)-(c-3)(c+3)=c^2-2bc+9
2) a*(a-3)(a+3)-(a-2)(a^2+2a+4)=a^3-9a-(a^3-8)=8-9a