Mathematics
Senior High
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数学の問題と解き方を教えておしいです
(2) 不等式 15x+21-13x-21≧2を満たすxの値の範囲を求めよ。
1
[**] x≤−3, 4≤x
3./≦x
<x
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範囲を考えるときに＝がつく場合とつかない場合があるのはなぜですか？