Question

Daca x supra y= 2 supra 5,atunci 2x+5y supra 3x+8y =?

Answer 1

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+40x/2
⇒2x+25x/2/3x+20x
⇒2x+12,5x/23x
⇒14,5x/23x⇒se reduce x cu x;
⇒14,5/23
⇒145/10 ·1/23
⇒145/230=29/46;⇒fractie ireductibila;