помогитее!
1) 1/(a-b)(a-c)+1/(b-c)(b-a)+1/(c-a)(c-b)
2) (x^2-y^2-z^2+2yz):(x+y-z/x+y-z)
1) 1/(a-b)(a-c)+1/(b-c)(b-a)+1/(c-a)(c-b)
2) (x^2-y^2-z^2+2yz):(x+y-z/x+y-z)
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