Úloha ID 1762 - 
Máme dva výrazy 21 _ 7 _ 2 a (7 _ 8) _ 3. Která ze znamének +, –, ·, : lze doplnit na vynechané místa tak, aby se výrazy rovnaly?
Správná odpověď je: E
21 : 7 + 2 = (7 + 8) : 3.
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