Uzupełnij.- Zadanie 1: Matematyka 7

Rozwiązanie

$a) - 1, 2 + □ = 4 \frac{1}{2}$

$- 1, 2 + □ = 4, 5$

$□ = 4, 5 + 1, 2$

$□ = 5, 7$

$- \frac{2}{5} - □ = 0, 6$

$- □ = 0, 6 + \frac{2}{5}$

$- □ = 0, 6 + 0, 4$

$- □ = 1$

$□ = - 1$

$b) 3, 5 - □ = - 2, 8$

$- □ = - 2, 8 - 3, 5$

$- □ = - 6, 3$

$□ = 6, 3$

$- 8 \frac{1}{2} + □ = \frac{1}{2}$

$□ = \frac{1}{2} + 8 \frac{1}{2}$

$□ = 9$

$c) - \frac{1}{2} \cdot □ = 6$

$□ = 6 : (- \frac{1}{2})$

$□ = 6 \cdot (- \frac{2}{1})$

$□ = - 12$

$0, 25 : □ = - \frac{1}{4}$

$□ = 0, 25 : (- \frac{1}{4})$

$□ = 0, 25 : (- 0, 25)$

$□ = - 1$