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©2025 数学クラブ http://sugaku.club/
月 日( )
● 次の方程式を解きなさい
[211-20]
(1)
2
4
(
x
+
1
)
=
9
(2)
2
1
(
x
−
1
)
=
6
(3)
6
2
25
(
x
+
)
=
5
36
(4)
5
2
(
x
−
)
=
1
6
(5)
2
9
(
x
+
1
)
=
16
(6)
5
2
64
(
x
+
)
−
=
0
6
49
(7)
6
2
(
x
+
)
=
1
7
(8)
1
2
9
(
x
−
)
=
3
49
(9)
1
2
9
(
x
−
)
=
3
4
(10)
3
2
(
x
+
)
=
1
2
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
(
x
+
1
)
4
=
9
x
+
1
2
=
±
3
x
2
=
−
1
±
3
x
1
5
=
−
,
−
3
3
(2)
2
(
x
−
1
)
1
=
6
x
−
1
6
=
±
6
x
6
=
1
±
6
(3)
6
2
(
x
+
)
5
25
=
36
6
x
+
5
5
=
±
6
x
6
5
=
−
±
5
6
x
11
61
=
−
,
−
30
30
(4)
5
2
(
x
−
)
6
=
1
5
x
−
6
=
±
1
x
5
=
±
1
6
x
11
1
=
,
−
6
6
(5)
2
(
x
+
1
)
9
=
16
x
+
1
3
=
±
4
x
3
=
−
1
±
4
x
1
7
=
−
,
−
4
4
(6)
5
2
64
(
x
+
)
−
6
49
=
0
5
x
+
6
8
=
±
7
x
5
8
=
−
±
6
7
x
13
83
=
,
−
42
42
(7)
6
2
(
x
+
)
7
=
1
6
x
+
7
=
±
1
x
6
=
−
±
1
7
x
1
13
=
,
−
7
7
(8)
1
2
(
x
−
)
3
9
=
49
1
x
−
3
3
=
±
7
x
1
3
=
±
3
7
x
16
2
=
,
−
21
21
(9)
1
2
(
x
−
)
3
9
=
4
1
x
−
3
3
=
±
2
x
1
3
=
±
3
2
x
11
7
=
,
−
6
6
(10)
3
2
(
x
+
)
2
=
1
3
x
+
2
=
±
1
x
3
=
−
±
1
2
x
1
5
=
−
,
−
2
2