Разложите на множители:
а) [tex]x(y+z)^2+y(x+z)^2+z(x+y)^2-4xyz[/tex]
б) [tex](ab+ac+bc)(a+b+c)-abc[/tex]
а) [tex]x(y+z)^2+y(x+z)^2+z(x+y)^2-4xyz[/tex]
б) [tex](ab+ac+bc)(a+b+c)-abc[/tex]
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