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z talesa:
x:5=(x+4):10
10x=5(x+4)
10x=5x+20
10x-5x=20
5x=20
x=20:5
x=4cm= odcinek DE
10|DE|=5|DE|+20cm
5|DE|=20cm /:5
|DE|=4 cm
*-razy