бс=АБ/2
бс=А
АБ=2А
4а**2=39**2*3+а**2
3а**2=39**2*3
а**2=39**2
а=39
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бс=АБ/2
бс=А
АБ=2А
4а**2=39**2*3+а**2
3а**2=39**2*3
а**2=39**2
а=39