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Math You Like 05/09/2017 at 10:26a(b - c) + b(c - a) + c(a - b)
=ab - ac + bc - ab + ca - cb
=0
1234 này selected this answer.
a(b - c) + b(c - a) + c(a - b)
=ab - ac + bc - ab + ca - cb
=0
1234 này selected this answer.