Прошу помогите
Строчно надо

$frac{4.5*3.2}{7.2} = frac{45*3.2}{72} = frac{5*3.2}{9}= frac{16}{9}=1 frac{7}{9}$

$frac{17}{5*4} = frac{17}{20}$
$frac{x21}{5*4} = frac{21}{20} =1 frac{1}{20}$
$frac{12}{5*4}= frac{3}{5}$

0.002*2*2000=0.002*2*2*1000=8
0.0001*1*100000=10
0.0004*0.4*40000=0.0004*0.4*4.10000=6.4