1.Сократите дробь х^2- xy/x^2-y^2
2.(a-2)(a+2)-a(a-1)
3. предст. в виде многочл. (a+b)(a-b)(a^2+b^2)
4.Упростить c(c-2)(c+2)-C-1)(c^2+c+1)
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