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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)
8
2
1
(
x
＋
)
−
=
0
7
3
(2)
2
(
x
＋
1
)
=
1
(3)
2
(
x
＋
1
)
=
1
(4)
1
2
(
x
−
)
−
1
=
0
2
(5)
3
2
4
(
x
−
)
−
=
0
5
9
(6)
2
9
(
x
＋
1
)
=
49
(7)
5
2
4
(
x
＋
)
−
=
0
7
3
(8)
1
2
2
(
x
＋
)
−
=
0
2
3
(9)
5
2
25
(
x
−
)
=
7
16
(10)
1
2
1
(
x
−
)
−
=
0
6
4
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
8
2
1
(
x
＋
)
−
7
3
=
0
8
x
＋
7
3
=
±
3
x
8
3
=
−
±
7
3
(2)
2
(
x
＋
1
)
=
1
x
＋
1
=
±
1
x
=
−
1
±
1
x
=
0
，
−2
(3)
2
(
x
＋
1
)
=
1
x
＋
1
=
±
1
x
=
−
1
±
1
x
=
0
，
−2
(4)
1
2
(
x
−
)
−
1
2
=
0
1
x
−
2
=
±
1
x
1
=
±
1
2
x
3
1
=
，
−
2
2
(5)
3
2
4
(
x
−
)
−
5
9
=
0
3
x
−
5
2
=
±
3
x
3
2
=
±
5
3
x
19
1
=
，
−
15
15
(6)
2
(
x
＋
1
)
9
=
49
x
＋
1
3
=
±
7
x
3
=
−
1
±
7
x
4
10
=
−
，
−
7
7
(7)
5
2
4
(
x
＋
)
−
7
3
=
0
5
x
＋
7
2
3
=
±
3
x
5
2
3
=
−
±
7
3
(8)
1
2
2
(
x
＋
)
−
2
3
=
0
1
x
＋
2
6
=
±
3
x
1
6
=
−
±
2
3
(9)
5
2
(
x
−
)
7
25
=
16
5
x
−
7
5
=
±
4
x
5
5
=
±
7
4
x
55
15
=
，
−
28
28
(10)
1
2
1
(
x
−
)
−
6
4
=
0
1
x
−
6
1
=
±
2
x
1
1
=
±
6
2
x
2
1
=
，
−
3
3