Докажите тождество : 1)(a³+1)(a-1)=(a²-a+1)(a²-1)
2)m³+1=m(m+1)+(1-m)(1-m²)
3)( a+2)(a²-2a+4)-a(a-3)(3+a)=9a+8
2)m³+1=m(m+1)+(1-m)(1-m²)
3)( a+2)(a²-2a+4)-a(a-3)(3+a)=9a+8
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