Ответ:
AB∣=(3−1)2+(1−2)2+(3−1)2=22+(−1)2+22=4+1+4=9=3
вроде
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Ответ:
AB∣=(3−1)2+(1−2)2+(3−1)2=22+(−1)2+22=4+1+4=9=3
вроде