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|AC|/|BC|=|DC|/|EC|
a)
|AC|=|DC|•|BC|/|EC|
|AC|=16•24/12
|AC|=32 cm
b)
|AD|=|AC|-|DC|
|DC|=|AC|•|EC|/|BC|
|DC|=|AC|•|EC|/(|BE|+|EC|)
|DC|=12•3/(5+3)
|DC|=4,5 dm
|AD|=12-4,5=7,5 dm