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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
−
3
)
=
7
(2)
2
(
x
＋
9
)
=
9
(3)
2
(
x
＋
8
)
=
100
(4)
2
(
x
＋
6
)
=
4
(5)
2
(
x
＋
3
)
−
25
=
0
(6)
2
(
x
＋
3
)
−
49
=
0
(7)
2
(
x
＋
8
)
=
64
(8)
2
(
x
＋
5
)
−
3
=
0
(9)
2
(
x
−
6
)
−
1
=
0
(10)
2
(
x
＋
7
)
−
1
=
0
(11)
2
(
x
＋
5
)
=
10
(12)
2
(
x
＋
6
)
=
4
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
−
3
)
=
7
x
−
3
7
=
±
x
7
=
3
±
(2)
2
(
x
＋
9
)
=
9
x
＋
9
=
±
3
x
=
−
9
±
3
x
=
−6
，
−12
(3)
2
(
x
＋
8
)
=
100
x
＋
8
=
±
10
x
=
−
8
±
10
x
=
2
，
−18
(4)
2
(
x
＋
6
)
=
4
x
＋
6
=
±
2
x
=
−
6
±
2
x
=
−4
，
−8
(5)
2
(
x
＋
3
)
−
25
=
0
x
＋
3
=
±
5
x
=
−
3
±
5
x
=
2
，
−8
(6)
2
(
x
＋
3
)
−
49
=
0
x
＋
3
=
±
7
x
=
−
3
±
7
x
=
4
，
−10
(7)
2
(
x
＋
8
)
=
64
x
＋
8
=
±
8
x
=
−
8
±
8
x
=
0
，
−16
(8)
2
(
x
＋
5
)
−
3
=
0
x
＋
5
3
=
±
x
3
=
−
5
±
(9)
2
(
x
−
6
)
−
1
=
0
x
−
6
=
±
1
x
=
6
±
1
x
=
7
，
5
(10)
2
(
x
＋
7
)
−
1
=
0
x
＋
7
=
±
1
x
=
−
7
±
1
x
=
−6
，
−8
(11)
2
(
x
＋
5
)
=
10
x
＋
5
10
=
±
x
10
=
−
5
±
(12)
2
(
x
＋
6
)
=
4
x
＋
6
=
±
2
x
=
−
6
±
2
x
=
−4
，
−8