Тотожність 2(a+b-c)+3(a-c)-5(a-c)=2b Треба довести

Question

Тотожність 2(a+b-c)+3(a-c)-5(a-c)=2b Треба довести

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а який клас

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Сьомий

Answer 1

2(a + b - c) + 3(a - c) - 5(a - c) = 2b
2a + 2b - 2c + 3a - 3c - 5a + 5c = 2b
2a + 3a - 5a = 0
-2c - 3c + 5c = 0

2b = 2b

Доказано