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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
9
(
x
−
1
)
=
4
(2)
2
4
(
x
−
1
)
−
=
0
7
(3)
3
2
4
(
x
−
)
−
=
0
5
9
(4)
3
2
(
x
+
)
−
1
=
0
4
(5)
2
49
(
x
−
1
)
=
25
(6)
4
2
2
(
x
+
)
=
3
5
(7)
4
2
16
(
x
+
)
−
=
0
3
49
(8)
1
2
(
x
+
)
=
1
2
(9)
1
2
(
x
−
)
=
1
3
(10)
2
2
36
(
x
−
)
=
3
25
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
(
x
−
1
)
9
=
4
x
−
1
3
=
±
2
x
3
=
1
±
2
x
5
1
=
,
−
2
2
(2)
2
4
(
x
−
1
)
−
7
=
0
x
−
1
2
7
=
±
7
x
2
7
=
1
±
7
(3)
3
2
4
(
x
−
)
−
5
9
=
0
3
x
−
5
2
=
±
3
x
3
2
=
±
5
3
x
19
1
=
,
−
15
15
(4)
3
2
(
x
+
)
−
1
4
=
0
3
x
+
4
=
±
1
x
3
=
−
±
1
4
x
1
7
=
,
−
4
4
(5)
2
(
x
−
1
)
49
=
25
x
−
1
7
=
±
5
x
7
=
1
±
5
x
12
2
=
,
−
5
5
(6)
4
2
(
x
+
)
3
2
=
5
4
x
+
3
10
=
±
5
x
4
10
=
−
±
3
5
(7)
4
2
16
(
x
+
)
−
3
49
=
0
4
x
+
3
4
=
±
7
x
4
4
=
−
±
3
7
x
16
40
=
−
,
−
21
21
(8)
1
2
(
x
+
)
2
=
1
1
x
+
2
=
±
1
x
1
=
−
±
1
2
x
1
3
=
,
−
2
2
(9)
1
2
(
x
−
)
3
=
1
1
x
−
3
=
±
1
x
1
=
±
1
3
x
4
2
=
,
−
3
3
(10)
2
2
(
x
−
)
3
36
=
25
2
x
−
3
6
=
±
5
x
2
6
=
±
3
5
x
28
8
=
,
−
15
15