помогите с алгеброй

при каких значениях а =0 значение дроби

a)(а^3-9a )/a^2+a-12

б)(a^5+2a^4 )/a^3+a+10

в)( a^5-4a^4+4a^3)/a^4-16

 очень надо помогите с решениями 

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