wpisz liczby (-12),6 i (-11) w odpowiednie kratki
a) 9+ _____+_____-____=20 b) 20+ _____-_____= (-9) - _____
a) 9+ (-12) + (-11) -6 = -20 b) 20 + (-12) -6= -9 - (-11)
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a) 9+ (-12) + (-11) -6 = -20 b) 20 + (-12) -6= -9 - (-11)