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Daca 2x/3y=0,75,calculati 3x-2y/5y

Răspuns :

2x/3y=0,75<=>2x/3y=75/100<=>2x/3y=3/4 =>8x=9y; (3x-2y)/5y=(3x+5x-5x-2y)/5y= (8x-5x-2y)/5y=(9y-2y-5x)/5y=(7y-5x)/5y= 7y/5y-5x/5y=7/5-x/y<=>7/5=x/y.

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