What is the average (arithmetic mean) of fff\([(\sqrt{8}+\sqrt{2}]^{2}and [(\sqr...【小站备考】

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What is the average (arithmetic mean) of

$[(\sqrt{8}+\sqrt{2}]^{2}and [(\sqrt{8}-\sqrt{2}]^{2}$ ??

A.4

B.5

C.8

D.10

E.12

我的答案：