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Stefania1926
a fost răspuns

X supra y = 2 supra 5
2x + 5y supra 3x + 8y = ?

Răspuns :

Danamocanu71
x/y=2/5⇒2y=5x⇒y=5x/2;
⇒2x+5y/3x+8y
⇒2x+5·5x/2/3x+8·5x/2
⇒2x+25x/2/3x+20x
⇒2x+25x/2/23x
⇒2x+12,5x/23x
⇒14,5x/23x⇒swe reduce x cu x;
⇒14,5/23=145/10 ·1/23=145/230=0,63;

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