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Aflati latimea unui dreptunghi stiind ca acesta are perimetrul P=3dm si lungimea L=6cm.

Răspuns :

3dm =30 cm L=6cm 2L=12 cm l=30-12 =18 18:2 =9 latimea are 9cm
P=3dm
P=30cm
P=2l+2L

2l+2L=30cm
l+L=30cm:2
l+L=15cm

L=6cm

l+6cm=15cm
l=15cm-6cm
l=9cm