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X/y=0,1. X+2y/2x-y=?

Răspuns :

x=0,1y
0,1y/x=1
x+2y=0,1y+2y=2,1y
2x-y=0,2y-y=-0,8y
2,1y/-0,8y=2,1/0,8=2,625