zadanie w załączniku
oznaczmy krawędź AC=a
tgB=x/a
ctga=(x+y)/a
tgB/(ctga-tgB)=[x/a] / [(x+y)/a - y/a]= [x/a] / [(x+y-x)/a]=
[x/a] / [y/a]=x/a * a/y= x/y
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oznaczmy krawędź AC=a
tgB=x/a
ctga=(x+y)/a
tgB/(ctga-tgB)=[x/a] / [(x+y)/a - y/a]= [x/a] / [(x+y-x)/a]=
[x/a] / [y/a]=x/a * a/y= x/y