1) (a²-3)³-(a-2)(a²+4)(a+2)=a⁶-9a⁴+27a²-27-(a²-4)(a²+4)=a⁶-9a⁴+27a²-27-(a⁴-16)=a⁶-9a⁴+27a²-27-a⁴+16=a⁶-10a⁴+27a²-11
2) (b²-3)³-(b²+3)(b⁴-3b²+9)=b⁶-9b⁴+27b²-27-(b⁶+27)=b⁶-9b⁴+27b²-27-b⁶-27=9b⁴+27b²-54
3) (m²-1)(m⁴+m²+1)-(m²-1)³=m⁶-1-(m⁶-3m⁴+3m²-1)=m⁶-1-m⁶+3m⁴-3m²+1=3m⁴-3m²=3m²(m²-1)
4) (x²-2)(x⁴+2x²+4)-(x³-1)²=x⁶-8-(x⁶-2x³+1)=x⁶-8-x⁶+2x³-1=2x³-9