х²+3х-54=0
Д=3²-4*1*(-54)=9+216=225=15²
х_1=(-3-15)/2=-18/2=-9
х_2=(-3+15)/2=12/2=6
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х²+3х-54=0
Д=3²-4*1*(-54)=9+216=225=15²
х_1=(-3-15)/2=-18/2=-9
х_2=(-3+15)/2=12/2=6