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Calculați: 7supra20 minus 2supra20 minus 1supra20​

Răspuns :

[tex]\frac{7}{20}- \frac{2}{20}- \frac{1}{20}\\\\ =\frac{7-2-1}{20}\\\\ =\frac{4}{20}[/tex]

Simplificam cu 4 si ne da:

[tex]=\frac{1}{5}[/tex]

[tex]\bf \dfrac{7}{20}-\dfrac{2}{20}-\dfrac{1}{20}=[/tex]

[tex]\bf \dfrac{7-2-1}{20}=[/tex]

[tex]\bf \dfrac{4}{20}=[/tex]

[tex]\bf \dfrac{\not4}{\not20}=[/tex] [tex]\boxed{\bf \dfrac{1}{5}}[/tex]