4. г) 9a³b⁻⁴c⁰=9a³/b⁴
xy⁻³-x⁻¹y²=x⁻¹y⁻³(x²-y⁵)=(x²-y⁵)/(xy³)
5. 1 a) (a³+1)/a³)/(a+1)²=(a³+1)/(a³*(a+1)²)=(a²-a+1)/(a³*(a+1))=(a²-a+1)/(a⁴+а³)
б) ((у²-х²)/(х²у²)):((у-х)/ху)=(у+х)/(ху)
2 а) (с/а)+(с/а)³=(с/а)*(1+(с²/а²)=(с³+са²)/а³
б) (b³+c³)/(b+c)=(b²-bc+c²)/1
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4. г) 9a³b⁻⁴c⁰=9a³/b⁴
xy⁻³-x⁻¹y²=x⁻¹y⁻³(x²-y⁵)=(x²-y⁵)/(xy³)
5. 1 a) (a³+1)/a³)/(a+1)²=(a³+1)/(a³*(a+1)²)=(a²-a+1)/(a³*(a+1))=(a²-a+1)/(a⁴+а³)
б) ((у²-х²)/(х²у²)):((у-х)/ху)=(у+х)/(ху)
2 а) (с/а)+(с/а)³=(с/а)*(1+(с²/а²)=(с³+са²)/а³
б) (b³+c³)/(b+c)=(b²-bc+c²)/1