A----------------C--------B
[tex]\displaystyle\bf\\AB=50\\\\AC + BC=50\\\\\frac{2}{3} BC+BC=50\\\\\\1\frac{2}{3} BC=50\\\\\\BC=50:1\frac{2}{3} =50:\frac{5}{3} =50\cdot \frac{3}{5} =30\\\\\\AC=50-BC=50-30=20\\\\\\Otvet \ : \ AC=20 \ cm[/tex]
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A----------------C--------B
[tex]\displaystyle\bf\\AB=50\\\\AC + BC=50\\\\\frac{2}{3} BC+BC=50\\\\\\1\frac{2}{3} BC=50\\\\\\BC=50:1\frac{2}{3} =50:\frac{5}{3} =50\cdot \frac{3}{5} =30\\\\\\AC=50-BC=50-30=20\\\\\\Otvet \ : \ AC=20 \ cm[/tex]