X²-10x+25= (х-5)²
х=5
по т. Виетта
х1+х2=-10
х1*х2=25
х1=5
х2=-5
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X²-10x+25= (х-5)²
х=5
по т. Виетта
х1+х2=-10
х1*х2=25
х1=5
х2=-5