10)1.=3-х+х²-4х+4/х³-8=7-5х+х²/х³-8=х²-5х+7/х³-8
2.=(а+1)(-4-а)-(а-5)/(а+1)(1-а+а²)=-4а-а²-4-а-а+5/а-а²+а³+1-а+а²=-а²-6а+1/а³+1
3.=6(n²-3n+9)-(n²-1)/(3+n)(n²-3n+9)=6n²-18n+54-n²+1/3n²-9n+27+n³-3n²+9n=5n²-18n+55/27+n³
4.=b²-4-3b²+6b-12/b³+8=-2b²+6b-16/b³+8
