a + b = b + a


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Slide 0

– 6 + 5 = –1 –6 0 + 5 –1; +5 –6 + 5 – 6 = –1. (–6) + (+5) = (+ 5) + (– 6) a + b = b + a ПЕРЕМЕСТИТЕЛЬНЫЙ ЗАКОН


Slide 1

– 6 + 5 + 6 = –1 –6 0 + 5 +5; +5 +6 (–6) + (+5) + (+6) = (a + b) + c = a + (b + c) = (+5) + (–6) + (+ 6) = = (+5) + (–6) + (+ 6) СОЧЕТАТЕЛЬНЫЙ ЗАКОН ( ) ( )


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