[文字サイズの変更]
▼
▲
©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)
2
(
x
+
1
)
−
1
=
0
(2)
2
2
1
(
x
+
)
=
3
4
(3)
2
2
1
(
x
+
)
=
5
9
(4)
4
2
(
x
+
)
=
1
5
(5)
1
2
3
(
x
+
)
=
2
2
(6)
2
(
x
+
1
)
=
1
(7)
3
2
4
(
x
+
)
=
2
9
(8)
3
2
(
x
+
)
=
1
2
(9)
10
2
1
(
x
+
)
−
=
0
7
16
(10)
4
2
1
(
x
+
)
−
=
0
5
4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
(
x
+
1
)
−
1
=
0
x
+
1
=
±
1
x
=
−
1
±
1
x
=
0
,
−2
(2)
2
2
(
x
+
)
3
1
=
4
2
x
+
3
1
=
±
2
x
2
1
=
−
±
3
2
x
1
7
=
−
,
−
6
6
(3)
2
2
(
x
+
)
5
1
=
9
2
x
+
5
1
=
±
3
x
2
1
=
−
±
5
3
x
1
11
=
−
,
−
15
15
(4)
4
2
(
x
+
)
5
=
1
4
x
+
5
=
±
1
x
4
=
−
±
1
5
x
1
9
=
,
−
5
5
(5)
1
2
(
x
+
)
2
3
=
2
1
x
+
2
6
=
±
2
x
1
6
=
−
±
2
2
(6)
2
(
x
+
1
)
=
1
x
+
1
=
±
1
x
=
−
1
±
1
x
=
0
,
−2
(7)
3
2
(
x
+
)
2
4
=
9
3
x
+
2
2
=
±
3
x
3
2
=
−
±
2
3
x
5
13
=
−
,
−
6
6
(8)
3
2
(
x
+
)
2
=
1
3
x
+
2
=
±
1
x
3
=
−
±
1
2
x
1
5
=
−
,
−
2
2
(9)
10
2
1
(
x
+
)
−
7
16
=
0
10
x
+
7
1
=
±
4
x
10
1
=
−
±
7
4
x
33
47
=
−
,
−
28
28
(10)
4
2
1
(
x
+
)
−
5
4
=
0
4
x
+
5
1
=
±
2
x
4
1
=
−
±
5
2
x
3
13
=
−
,
−
10
10