Răspunsuri

2014-05-12T16:36:01+03:00
L=lungime
l=latime
2L=3l
P=20cm
L=3l/2
P=2L+2l
inlocuim
20=2*3l/2+2l
20=3l+2l
20=5l
l=20/5
l=4
L=(3*4)/2
L=6
3 3 3
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2014-05-12T16:37:24+03:00
L+L+l+l=20
2L+2l=20 /:2
L+l=10

2L=3l => L=3l/2

3l/2+l=10. AMplificam cu 2
3l+2l=20
5l=20
l=20:5
l=4

L=3*4/2
L=12/2
L=6