4c²-4a: ab³-b³c² при b=2

<span>4c²-4a: ab³-b³c²=
1) </span>4c²-4a=4(c<span>²-a)
2)</span>ab³-b³c²=-b³(c<span>²-a)
3)</span>4(c²-a):-b³(c²-a)=4:-b<span>³
4/-2</span><span>³=4/-8=-0,5</span>