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2014-10-08T22:16:56+03:00
a(b+c)(b+c-a)+b(a+c)(a+c-b)+c(a+b)(a+b-c)=6abc
(ab+ac)(b+c-a)+(ba+bc)(a+c-b)+(ca+cb)(a+b-c)=6abc
ab
²+abc-a²b+abc+ac²-a²c+a²b+abc-ab²+abc+bc²-b²c+a²c+abc-ac²+abc+b²c-bc²=6abc
ab²-ab²-a²b+a²b+ac²-ac²-a²c+a²c+bc²-bc²-b²c+b²c+6abc=6abc
6abc=6abc
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