(x+1)(x⁷-x⁶+x⁵-x⁴+x³-x²+x-1) = x⁸+x⁷-x⁷-x⁶+x⁶+x⁵-x⁵-x⁴+x⁴+x³-x³-x²+x²+x-x-1 = x⁸-1
P=64
CD=AB+4
P=2AB+2CD
P=2AB+2AB+8
64=4AB+8
56=4AB
AB=14
CD=18
X^2/3-3=0
x^2/3=3
x^2=9
!x!=3
x=3
x=-3
2) 3*2=6
3) 5*3=15
4) 3.корень 2*4=3.корень 8=2
5) 3.корень 9*24=3.корень 216=6
А(а+2в)-(в+а)²=а²+2ав-(в²+2ав+а²)=а²+2ав-в²-2ав-а²= - в²