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Sin #2665453

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Opmerkings

sharptoothed sharptoothed 10 Augustus 2013 10 Augustus 2013 om 10:18:58 UTC flag Report link Permalink

√16 = -4 ? :-)

tommy_san tommy_san 10 Augustus 2013 10 Augustus 2013 om 10:26:16 UTC flag Report link Permalink

4 and −4 are square roots of 16 because 42 = (−4)2 = 16.
http://en.wikipedia.org/wiki/Square_root

√16 means the *positive* square root of 16. There also exists the negative square root, i.e. -√16.

sharptoothed sharptoothed 10 Augustus 2013 10 Augustus 2013 om 10:41:46 UTC flag Report link Permalink

あ、なるほど。^^ I completely forgot that square root of a number "a" is a number "b" for which the following is true: b^2 = a :-)
By the way, if 平方根 is "square root", is there any word for "principal (or arithmetic) square root" that has only non-negative result?

tommy_san tommy_san 10 Augustus 2013 10 Augustus 2013 om 10:50:01 UTC flag Report link Permalink

「正の平方根」ww
√3は「ルートさん」と読みます。「3の平方根」は「ルート3」と「マイナスルート3」の2つです。

tommy_san tommy_san 10 Augustus 2013 10 Augustus 2013 om 10:50:30 UTC flag Report link Permalink

って、じゃあこっちを挙げた方が有意義ですね。差し替えます。

tommy_san tommy_san 10 Augustus 2013 10 Augustus 2013 om 10:52:09 UTC flag Report link Permalink

*****読み方*****
「さんのへいほうこんはルートさんとマイナスルートさんである。」

sharptoothed sharptoothed 10 Augustus 2013 10 Augustus 2013 om 10:57:05 UTC flag Report link Permalink

分かりました!ありがとうございます、とみー先生!^^

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License: CC BY 2.0 FR

Lochboek

This sentence is original and was not derived from translation.

16の平方根は4と-4である。

tafoege troch tommy_san, 10 Augustus 2013

3の平方根は√3と-√3である。

bewurke troch tommy_san, 10 Augustus 2013

3の平方根は√3と−√3である。

bewurke troch tommy_san, 3 Septimber 2013

keppele troch Helio, 8 Maaie 2016

keppele troch kedymera, 3 Novimber 2020