Решите уравнение: а) 5х2 – 25х = 0; б) 5х2 + 3х – 2 = 0; в) х2 + 10х + 9 = 0; г) 3х2 – 9 = 0; д) 5х2 – х + 2 = 0; е) 25х2 + 110х + 121 = 0.​
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