а) A= (x^12-1)/(x^4-1)=(x^4-1)(x^8+x^4+1)/(x^4-1)=x^8+x^4+1,
б) A= (x^12-1)/(x^2-1)=(x^2-1)(x^2+1)(x^8+x^4+1)/(x^2-1)=(x^2+1)(x^8+x^4+1),
в) A= (x^12-1)/(x^12-2)=1+1/(x^12-2)
г) A= (x^12-1)/(x+1)=(x+1)(x-1)(x^2+1)(x^8+x^4+1)/(x+1)=(x-1)(x^2+1)(x^8+x^4+1)
д) A=(x^12-1)/(x-1)=(x+1)(x-1)(x^2+1)(x^8+x^4+1)/(x-1)=(x+1)(x^2+1)(x^8+x^4+1)
е) A=(x^5-32)/(x-2)=(x-2)(x^4+2x^3+4x^2+8x+16)/(x-2)=(x^4+2x^3+4x^2+8x+16)
ж) A=(x^6-64)/(x-2)=(x-2)(x^5+2x^4+4x^3+8x^2+16x+32)/(x-2)= (x^5+2x^4+4x^3+8x^2+16x+32)
з) A=(x^7-128)/(x-2)=(x-2)(x^6+2x^5+4x^4+8x^3+16x^2+32x+64)/(x-2)= (x^6+2x^5+4x^4+8x^3+16x^2+32x+64)