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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
(
x
+
)
−
1
=
0
2
(2)
2
1
(
x
+
1
)
=
4
(3)
2
1
(
x
−
1
)
=
9
(4)
7
2
3
(
x
+
)
=
6
4
(5)
4
2
1
(
x
−
)
−
=
0
5
25
(6)
2
1
(
x
+
1
)
=
3
(7)
1
2
1
(
x
+
)
−
=
0
2
4
(8)
3
2
9
(
x
−
)
−
=
0
5
25
(9)
1
2
1
(
x
+
)
=
2
16
(10)
2
2
25
(
x
+
)
−
=
0
7
36
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
1
2
(
x
+
)
−
1
2
=
0
1
x
+
2
=
±
1
x
1
=
−
±
1
2
x
1
3
=
,
−
2
2
(2)
2
(
x
+
1
)
1
=
4
x
+
1
1
=
±
2
x
1
=
−
1
±
2
x
1
3
=
−
,
−
2
2
(3)
2
(
x
−
1
)
1
=
9
x
−
1
1
=
±
3
x
1
=
1
±
3
x
4
2
=
,
3
3
(4)
7
2
(
x
+
)
6
3
=
4
7
x
+
6
1
3
=
±
2
x
7
1
3
=
−
±
6
2
(5)
4
2
1
(
x
−
)
−
5
25
=
0
4
x
−
5
1
=
±
5
x
4
1
=
±
5
5
x
3
=
1
,
5
(6)
2
(
x
+
1
)
1
=
3
x
+
1
3
=
±
3
x
3
=
−
1
±
3
(7)
1
2
1
(
x
+
)
−
2
4
=
0
1
x
+
2
1
=
±
2
x
1
1
=
−
±
2
2
x
=
0
,
−1
(8)
3
2
9
(
x
−
)
−
5
25
=
0
3
x
−
5
3
=
±
5
x
3
3
=
±
5
5
x
6
=
,
0
5
(9)
1
2
(
x
+
)
2
1
=
16
1
x
+
2
1
=
±
4
x
1
1
=
−
±
2
4
x
1
3
=
−
,
−
4
4
(10)
2
2
25
(
x
+
)
−
7
36
=
0
2
x
+
7
5
=
±
6
x
2
5
=
−
±
7
6
x
23
47
=
,
−
42
42