Объяснение:
1)(a+1)(a²-a+1)-a³=a³-1-a³=1
2)(x+y)(x²-xy+y²)-x(x²+y²)=x³+y³-x³-xy²=y³-xy²
3)(m-2)(m²+2m+4)+8=m³-8+8=m³
4)(c+3)(c²-3c+9)-27=c³+27-27=c³
Объяснение:
1)(a+1)(a²-a+1)-a³=a³-1-a³=1
2)(x+y)(x²-xy+y²)-x(x²+y²)=x³+y³-x³-xy²=y³-xy²
3)(m-2)(m²+2m+4)+8=m³-8+8=m³
4)(c+3)(c²-3c+9)-27=c³+27-27=c³