Ответы на вопрос:
1) ab = a + b
2) bc = 3*(b + c) = 3b + 3c
3) ac = 2a + 2c
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c = (2a + 2c) : a
b = (3b + 3c) : c
a = ab - b
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a*b \ c = (ab - b)*(3b + 3c) \ c \ c = 3ab^2 + 3abc - 3b^2 - 3bc \ c ^2
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