Mathematics
Senior High
Resolved
この縦線の意味とはなんですか？
10
絶対値どうしの掛け算、割り算は成り立つんだ。
|a||b|=|ab|,
b
例えば, -xなら
|-x|=|(-1) x|
=|-1|||
=1.|x|
=|x|
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ありがとうございます！