Question

calculati 14 pe 4 - 3 pe 7 • 2,5
100 1 pe 4 - 4 •3,5²
Va rogg

Answer 1

° 2,5=25/10(simplificam prin 5)=5/2
=14/4 - 3/7 ×5/2=
= 14/4- 15/14= (aduxem la același numitor (28), pe prima o amplificăm cu 7,pe a doua cu 2)
=98/28-30/28=
=68/28=(simplificam prin 2)
= 34/14=(simplificam prin 2)
=17/7

°

Answer 2

$\frac{14}{4} - \frac{3}{7} \times \frac{25}{10} = \frac{14}{4} - \frac{75}{70} = \\ \frac{7}{2} - \frac{15}{14} = \frac{49}{14} - \frac{15}{14} = \\ \frac{34}{14} = \frac{17}{7}$
............
$100 \frac{1}{4} - 4 \times 3.5 {}^{2} = \\ \frac{401}{4} - 4 \times 12.25 = \\ \frac{401}{4} - \frac{49}{1} = \\ \frac{401}{4} - \frac{196}{4} = \frac{205}{4}$