Dodawanie i odejmowanie

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Oblicz:

 $3\ \frac{1}{2}+\left(-2,6\right)=$  

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Oblicz:

 $-2,65+\left(-4,32\right)=$  

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 $2\ \frac{3}{8}+\left(-6\ \frac{1}{4}\right)=$  

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 $\frac{1}{5}+2\ \frac{3}{4}+\left(-6\ \frac{1}{2}\right)=$