Question

7 pe 20 minus 5 pe 18

Answer 1

$\frac{7}{20} - \frac{5}{18} = \frac{126 -100}{360} = \frac{26}{360} = \frac{13}{180}$

Answer 2

$|=fractie$
$7|20-5|18=$
$Calculam~cmmmc~: 20=2^2*5; ~18=2*3^2$
$cmmmc=2^2*5*3^2=180$
$7|20~(aplificam~cu~9)= 63|180$
$5|18 ~(aplificam~cu~10)=50|180$
$63|180-50|180=13|180$