Aflati lungimea si latimea unui dreptunghi cu perimetrul de 76 cm daca:
a)L= l+7cm ;
b) l=L-4cm .
Ajutati-ma va rog !! :((

Răspunsul a fost dat de: USER8267
29 Agustus 2025 matematica 5 minute
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Întrebare

Clasă: Education Materie: matematica
Aflati lungimea si latimea unui dreptunghi cu perimetrul de 76 cm daca:
a)L= l+7cm ;
b) l=L-4cm .
Ajutati-ma va rog !! :((
Întrebare a fost pusă de:
140 Vezi 140 Răspunsuri

Răspuns (140)

Cel mai bun răspuns
(356)
perimetrul unui dreprungi este asa
P=2L+2l

a) L=l+7
  P=76
deci
2L+2l=76
2(l+7)+2l=76
2l+14+2l=76
4l=76-14
4l=62
l=62:4
l=15.5
L=15,5+7=22,5

b)l=L-4
P=76

2L+2l=76
2L+2(L-4)=76
2L+2L-8=76
4L=76+8
4L=84
L=84:4
L=21
l=21-4=17
Răspunsul a fost dat în data 29 Agustus 2025

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