Mathematics
Senior High
なぜ不等号の向きが-9の時と9の時でかわるのですか？
95 次の不等式を解け。
(1)|3x|≧9
I>x
30.0
9 ≤ 3x
95 (1) 3x-9,
よって x ≤-3, 3≤ x
(2) -5<x +4 < 5
S1+
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