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Calculati distanta dintre 2 persoane situate intr-un teren ,de o parte si de alta a unui lac , 
AM=Xm
MB=8m
BC=15m
MN=13m
MN || BC[tex] \frac{x+8}{x}= \frac{15}{13}[/tex]


Răspuns :

[tex]\dfrac{BC}{MN}=\dfrac{AB}{AM}\Rightarrow\dfrac{15}{13}=\dfrac{AB}{AB-8}\Rightarrow13AB=15AB-120\Rightarrow AB=60\ m[/tex]