Odpowiedź:
3/4 * 4,2 - (0,7)² = 0,75 * 4,5 - 0,49 = 3,375 - 0,49 = 2,885
2 i 1/3 * 0,14 - (0,8)² = 7/3 * 14/100 - 64/100 = 98/300 - 64/100 = 98/300 - 192/300 = -94/300 = -47/150
[tex]\frac{3}{4}\cdot4,2-(0,7)^2=\frac{3}{4}\cdot\frac{42}{10}-(\frac{7}{10})^2=\frac{3}{4}\cdot\frac{21}{5}-\frac{49}{100}=\frac{63}{20}-\frac{49}{100}=\frac{315}{100}-\frac{49}{100}=\frac{266}{100}=\\\\=\frac{133}{50}=2\frac{33}{50}[/tex]
[tex]2\frac{1}{3}\cdot0,14-(0,8)^2=\frac{7}{3}\cdot\frac{14}{100}-(\frac{8}{10})^2=\frac{7}{3}\cdot\frac{7}{50}-(\frac{4}{5})^2=\frac{49}{150}-\frac{16}{25}=\frac{49}{150}-\frac{96}{150}=-\frac{47}{150}[/tex]
