If fff$1+x+x^2+x^3=60$/fff, then the average (arithmetic mean) of x, fff\(x^2,...【小站备考】

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$1+x+x^2+x^3=60$ , then the average (arithmetic mean) of x,

$x^2, x^3, and x^4$ is equal to which of the following?

A.12x

B.15x

C.20x

D.30x

E.60x

我的答案：

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