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cat face: radical 45 - radical 63 
                  SUPRA
             radical 28   - radical 20


Răspuns :

(rad45-rad63)/(rad28-rad20)=(3rad5-3rad7)/(2rad7-2rad5)=-3(rad5-rad7)/2(rad7-rad5)=
=-3/2
[tex]\dfrac{\sqrt{45}-\sqrt{63}}{\sqrt{28}-\sqrt{20}}=\dfrac{3\sqrt5-3\sqrt7}{2\sqrt7-2\sqrt5}=\dfrac{3(\sqrt5-\sqrt7)}{-2(\sqrt5-\sqrt7)}=-\dfrac32[/tex]