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  5. (10.6.8)で〈(x -〈x〉)²〉=...
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ペンローズ
ペンローズ

(10.6.8)で〈(x -〈x〉)²〉=(Δx)²になるのはどうしてですか？

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✨ Best Answer ✨

Crystal Clear
Crystal Clear

<(x -<x>)²>
=<(x²-2<x>x+<x>²)>
=<x²>-2<x><x>+<x>²
=<x²>-<x>²
=(Δx)²

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