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