109 supra 50:y=109supra 1000
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Răspuns :

[tex] \frac{109}{50} : \frac{109}{1000} = \frac{109}{50} * \frac{1000}{109} =20[/tex]
109/50 : y=109/1000
109/50=109/1000 *y
109*1000=109*50 y |:109
1000=50 y
y=1000/50=20