№1
1)3a(1+2b)+15b(1+2b)
2)(3a+15b)(1+2b)
№2
(x-1)*(x+1)*(x^2+1)*(x^4+1)
.....................................
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
X1=-4
x2=5-4=1
x2=5-1=4
x3=5+4=9
x4=5+9=11
x5=5+11=16
x6=5+16=21
(а^2+4a-3a-12)-(a^2+a+5a+5)=a^2+a-12-a^2-6a-5= -5a-17=-5*(-1/3)-17= -15(целых) 1/3