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©2026 数学クラブ http://sugaku.club/
月 日( )
● 次の方程式を解きなさい
[211-20]
(1)
1
2
9
(
x
+
)
=
2
16
(2)
1
2
1
(
x
+
)
−
=
0
5
4
(3)
2
2
(
x
−
1
)
−
=
0
5
(4)
1
2
36
(
x
+
)
=
2
25
(5)
3
2
(
x
+
)
=
1
2
(6)
1
2
(
x
−
)
=
1
3
(7)
2
4
(
x
+
1
)
=
9
(8)
2
9
(
x
−
1
)
−
=
0
25
(9)
2
1
(
x
−
1
)
=
16
(10)
2
25
(
x
+
1
)
−
=
0
36
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
1
2
(
x
+
)
2
9
=
16
1
x
+
2
3
=
±
4
x
1
3
=
−
±
2
4
x
1
5
=
,
−
4
4
(2)
1
2
1
(
x
+
)
−
5
4
=
0
1
x
+
5
1
=
±
2
x
1
1
=
−
±
5
2
x
3
7
=
,
−
10
10
(3)
2
2
(
x
−
1
)
−
5
=
0
x
−
1
10
=
±
5
x
10
=
1
±
5
(4)
1
2
(
x
+
)
2
36
=
25
1
x
+
2
6
=
±
5
x
1
6
=
−
±
2
5
x
7
17
=
,
−
10
10
(5)
3
2
(
x
+
)
2
=
1
3
x
+
2
=
±
1
x
3
=
−
±
1
2
x
1
5
=
−
,
−
2
2
(6)
1
2
(
x
−
)
3
=
1
1
x
−
3
=
±
1
x
1
=
±
1
3
x
4
2
=
,
−
3
3
(7)
2
(
x
+
1
)
4
=
9
x
+
1
2
=
±
3
x
2
=
−
1
±
3
x
1
5
=
−
,
−
3
3
(8)
2
9
(
x
−
1
)
−
25
=
0
x
−
1
3
=
±
5
x
3
=
1
±
5
x
8
2
=
,
5
5
(9)
2
(
x
−
1
)
1
=
16
x
−
1
1
=
±
4
x
1
=
1
±
4
x
5
3
=
,
4
4
(10)
2
25
(
x
+
1
)
−
36
=
0
x
+
1
5
=
±
6
x
5
=
−
1
±
6
x
1
11
=
−
,
−
6
6