1) (a^2-4*a*b+4*b^2)*(a-2*b)=a^3-6*a^2*b+12*a*b^2-8*b^3= a^3-6*a^2*b+12*a*b^2
2) 27-(x^3-6*x^2+12*x-8)=27-x^3+6*x^2-12*x+8=: 35-x^3+6*x^2-12*x
<span>(a+b)</span>² <span>- 2ab + a</span>² <span>- b</span>² <span>= a*2a</span>
<span>а</span>² + 2ab + b²- 2ab + a² - b² = 2a²
<span>2a</span>² = 2a²<span> </span>