5. Zadatak

$$238+262=500$$ $$237+263=500$$ $$236+264=500$$

Lijeva strana jednakosti je $1500+\Delta$.

Desna strana jednakosti:

$$16\cdot23+82\cdot(35-19)-5\cdot16=$$ $$=16\cdot23+82\cdot16-5\cdot16=$$ $$=16\cdot(23+82-5)=$$ $$=16\cdot100=$$ $$=1600$$

Na kraju, $1500+\Delta=1600$ te je $\Delta=100$.