8a-32b=8(а-4b)
a+b+5(a+b)=a+b+5a+5b=6a+6b=6(a+b)
64-a²=8²-a²=(8-a)(8+a)
<span>a²-10a+25=(a-5)</span>²
= 2(a-x)+a(x-a)=2(a-x)-a(a-x)=(a-x)(2-a) дальше сама подставишь
(sint-cost)^2+2sintcost=sin^2t-2costsint+cos^2t+2sintcost=sin^2t+cos^2t
1,2,3,4,5,6,7,8,9,10,11,12,13,14 15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30 P(A)=4/30