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20 supra 15 minus 18 supra 9​

Răspuns :

[tex]\it \dfrac{\ 20^{(5}}{15}-\dfrac{\ 18^{(3}}{9}=\dfrac{4}{3}-\dfrac{6}{3}=\dfrac{4-6}{3}=-\dfrac{2}{3}[/tex]