Mathematics
Senior High
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合っていますでしょうか？
(2)
x + 1 ≤ 9 ( x + 1) < 5 x + 17
+17
x + 1 ≤ 9 x + 9 < 5 x T
-8x=8
4x<8
しく2
x = − |
-
-1
0
2
-1≦x<2
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