Ответы на вопрос:
F(2+√7)=7-(2+√7)²=7-(4+4√7+7)=-4-4√7 f(2-√7)=7-(2-√7)²=7-(4-4√7+7)=-4+4√7 [ f(2+√7)-f(2-√7) ]/ [ f(2-√7)+f(2+√7) ]=[ (-4-4√+4√7) ] / [ (-4+4√7)+(-4-4√7) ]=-8√7/(-8)=√7
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