Úloha ID 1730 - 
A je vzdálenost libovolného čísla na číselné ose x od čísla 0. B je vzdálenost libovolného čísla na číselné ose x od čísla 2. Co platí pro číslo C, jehož závislost na čísle x je vyobrazena na následujícím grafu?
Správná odpověď je: C
Můžeme si pomoci tabulkou hodnot pro jednotlivá čísla C z odpovědí a) až e):
| a) | b) | c) | d) | e) | |||
| x | A | B | C | C | C | C | C |
| –3 | 3 | 5 | –2 | 1.67 | 8 | 4 | –7 |
| –2 | 2 | 4 | –2 | 2.00 | 6 | 4 | –6 |
| –1 | 1 | 3 | –2 | 3.00 | 4 | 4 | –5 |
| 0 | 0 | 2 | –2 | – | 2 | 4 | –4 |
| 1 | 1 | 1 | 0 | 1.00 | 2 | 0 | –1 |
| 2 | 2 | 0 | 2 | 0.00 | 2 | –4 | 2 |
| 3 | 3 | 1 | 2 | 0.33 | 4 | –4 | 1 |
| 4 | 4 | 2 | 2 | 0.50 | 6 | –4 | 0 |
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