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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
[211-00]
(1)
2
(
x
＋
5
)
=
1
(2)
2
(
x
−
6
)
−
4
=
0
(3)
2
(
x
＋
4
)
=
1
(4)
2
(
x
＋
7
)
=
100
(5)
2
(
x
−
4
)
=
9
(6)
2
(
x
＋
9
)
=
9
(7)
2
(
x
−
5
)
=
9
(8)
2
(
x
−
3
)
=
16
(9)
2
(
x
−
4
)
−
9
=
0
(10)
2
(
x
−
5
)
=
3
(11)
2
(
x
＋
3
)
=
9
(12)
2
(
x
＋
7
)
=
8
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
5
)
=
1
x
＋
5
=
±
1
x
=
−
5
±
1
x
=
−4
，
−6
(2)
2
(
x
−
6
)
−
4
=
0
x
−
6
=
±
2
x
=
6
±
2
x
=
8
，
4
(3)
2
(
x
＋
4
)
=
1
x
＋
4
=
±
1
x
=
−
4
±
1
x
=
−3
，
−5
(4)
2
(
x
＋
7
)
=
100
x
＋
7
=
±
10
x
=
−
7
±
10
x
=
3
，
−17
(5)
2
(
x
−
4
)
=
9
x
−
4
=
±
3
x
=
4
±
3
x
=
7
，
1
(6)
2
(
x
＋
9
)
=
9
x
＋
9
=
±
3
x
=
−
9
±
3
x
=
−6
，
−12
(7)
2
(
x
−
5
)
=
9
x
−
5
=
±
3
x
=
5
±
3
x
=
8
，
2
(8)
2
(
x
−
3
)
=
16
x
−
3
=
±
4
x
=
3
±
4
x
=
7
，
−1
(9)
2
(
x
−
4
)
−
9
=
0
x
−
4
=
±
3
x
=
4
±
3
x
=
7
，
1
(10)
2
(
x
−
5
)
=
3
x
−
5
3
=
±
x
3
=
5
±
(11)
2
(
x
＋
3
)
=
9
x
＋
3
=
±
3
x
=
−
3
±
3
x
=
0
，
−6
(12)
2
(
x
＋
7
)
=
8
x
＋
7
2
=
±
2
x
2
=
−
7
±
2