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DRAGONLOR27
@DRAGONLOR27
July 2022
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Числа x и y такие, что 1/х-1/у=1/х+у. Докажите, что 1/х^2-1/у^2=1/ху.
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mikael2
1/х-1/у=1/(х+у)
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1/x
²-1/y²=(1/x-1/y)(1/x+1/y)=[1/(x+y)]*[(x+y)/xy]=1/xy
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