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X+y supra 2x+y =4 supra 5 , atunci aflati x supra y

Răspuns :

(x+y)/(2x+y)=4/5
5x+5y=8x+4y
3x=y
x=y/3
x/y=1/3

(x+y)/(2x+y)=4/5; 5(x+y)=4(2x+y); 5x+5y=8x+4y; 5x-8x=4y-5y; -3x=-y; 3x=y; x/y=3.