(x+2)³= x³+6x²+12x+8
(y-2)³= y³-6y²+12y-8
(2x-1)³= 8x³-12x²+6x-1
(3x+1)³= 27x³+27x²+9x+1
x³-3x²+3x-1=x³-3x²
x³-3x²+3x-1-x³+3x²=0
3x-1=0
x= 1/3
x³+3x²+3x+1=x³+3x²+2
x³+3x²+3x+1-x³-3x²-2=0
3x-1=0
x= 1/3
x³+x²+x-x²-x-1-x-x³=0
-1-x=0
x= -1
y³-2y²+4y+2y²-4y+8-y³-2y=0
8-2y=0
y=4
<span> p(a)=p1(a)+p2(a)=6х²-4+5х²-10=11х²-14</span>
-6(4-3x)-18x-12=-24+18x-18x-12=-24-12=-36
S4 = 20
d = - 4
(a1 + an)/2*n = 20
(a1 + a1 + d(n - 1))/2*4 = 20
(2a1 - 4n + 4)*2 = 20
2a1 - 4n + 4 = 10
2a1 - 4*4 + 4 = 10
2a1 - 16 + 4 = 10
2a1 - 12 = 10
2a1 = 22
a1 = 11