Odejmowanie liczb całkowitych
Wpisz liczby -12, 6 i -11 w odpowiednie kratki.
a) 9 + [ ] + [ ] - [ ] = -20 b) 20 + [ ] - [ ] = -9 - [ ]
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9 + (-11) + 6- (-12) = -20
20 + (-11) - 6 = -9 - 6