1) 5x*8y(-7x^2)+(-6x)*3y^2=-18*x*y^2-280*x^3*y
2)2a*a^2*3b+a*8c=8*a*c+6*a^3*b
1) -2(2p-1)+4=6-4*p
2) 33-8(11n-1)-2n =41-90*n
4x*3x-(3x-1)(2x+4)=12x²-6x²+2x-12x+4=6x²-10x+4=2*(3x²-5x+2)=
=2*3*(x-1)*(x-2/3)=6*(x-1)*(x-2/3).
Y=2(x^2+6x+9)-1
y=2x^2+12+17
x=-b/2a
x=-12/4=-3
А6=15 d=1
A6=a1+a5
A6=a1+d(n-1)
15=a1+5
A1=15-5
A1=10
a15=a1+d(n-1)
A15=10+1(15-1)
A15=24
Sn=(a1+an)/2 * n
S15=(10+24)/2 *15
S15=34/2 * 15
S15=17*15
S15=255