а) (x²-7) / (x-√7) = (x-√7)•(x+√7) / x-√7 = x+√7
б) (а+√5а) / (√15+√3а) = (√a•(√a+√5)) / (√3•(√5+√a)) = √a / √3
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а) (x²-7) / (x-√7) = (x-√7)•(x+√7) / x-√7 = x+√7
б) (а+√5а) / (√15+√3а) = (√a•(√a+√5)) / (√3•(√5+√a)) = √a / √3