1/x1+1/x2=(x2+x1)/(x1·x2)= -4/(-2)=2.
по т.Виета x1+x2=-4,x1x2=-2.
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1/x1+1/x2=(x2+x1)/(x1·x2)= -4/(-2)=2.
по т.Виета x1+x2=-4,x1x2=-2.