Question

Calculați: 7supra20 minus 2supra20 minus 1supra20​

Answer 1

$\frac{7}{20}- \frac{2}{20}- \frac{1}{20}\\\\ =\frac{7-2-1}{20}\\\\ =\frac{4}{20}$

Simplificam cu 4 si ne da:

$=\frac{1}{5}$

Answer 2

$\bf \dfrac{7}{20}-\dfrac{2}{20}-\dfrac{1}{20}=$

$\bf \dfrac{7-2-1}{20}=$

$\bf \dfrac{4}{20}=$

$\bf \dfrac{\not4}{\not20}=$ $\boxed{\bf \dfrac{1}{5}}$