Mathematics
Senior High
練習24の解き方、途中式が分かりません！
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お願いしますm(_ _)m
答えは、
a＞0のとき x＜-2a，a/2＜x
a＜0のとき x＜a/2，-2a＜x
a＝0のとき x≠0のすべての実数
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