Поможете? Дам 5 балов. a + b = b + a
a + b + c = a + (b + c) = (a + b) + c
Вычисли, применяя данные свойства:
⦁ (–5,4) + (–9) + (–4,6)=
⦁ 17 + (–5,7) + (–1,3)=
⦁ (–1,8) + 23 + (–1,2)=
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