Помогите пожалуйста решить систему как можно подробно
[tex] \left \{ {{ a_{1}+ a_{1}*q+ a_{1}* q^{2} =21} \atop { a_{1}^2+ a_{1}^2*q^2+ a_{1}^2*q^4 }=189} \right. [/tex]
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