Răspuns :
a=4x ; b=8x ; c=8x
a+b+c=60
4x+8x+8x=20x=> x=60:20=3
=>a=4•3=12 , b=8•3=24 , c=8•3=24
a+b+c=60
4x+8x+8x=20x=> x=60:20=3
=>a=4•3=12 , b=8•3=24 , c=8•3=24
/=fractie
a+b+c=60 cm
{A,b,c}
{4; 8; 8}
Direct proporționale
A/4=b/8=c/8
8a=4b➡ a=4b/8
8c=8b➡ c=8b/8
4b/8+ b+ 8b/8=60 cm
Amplificam b cu 8 pt a aduce toate fractile la acelas numitor
4b/8+ 8b/8+ 8b/8= 60 cm
4b+8b+8b/8=60 cm
20 b/8=60 cm
20b=60×8
20 b=480 cm
B=480/20
B=24 cm
A= 24cm×4/8
A=12 cm
C=8×24/8
C=24
a+b+c=60 cm
{A,b,c}
{4; 8; 8}
Direct proporționale
A/4=b/8=c/8
8a=4b➡ a=4b/8
8c=8b➡ c=8b/8
4b/8+ b+ 8b/8=60 cm
Amplificam b cu 8 pt a aduce toate fractile la acelas numitor
4b/8+ 8b/8+ 8b/8= 60 cm
4b+8b+8b/8=60 cm
20 b/8=60 cm
20b=60×8
20 b=480 cm
B=480/20
B=24 cm
A= 24cm×4/8
A=12 cm
C=8×24/8
C=24