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2023-12-11 20:00:48
a, a.(b+c) - b.(a+c) = ab + ac -ba -bc = ab - ba + ac-bc = ac-bc=c(a-b)
=> Điều phải chứng minh
b, -(a+b).c - c.(a-b) = -ac -bc -ca + bc = -ac-ca = -2ac
=> Điều phải chứng minh