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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
)
=
4
(2)
2
(
x
＋
9
)
−
9
=
0
(3)
2
(
x
＋
7
)
=
1
(4)
2
(
x
＋
9
)
−
16
=
0
(5)
2
(
x
−
7
)
−
25
=
0
(6)
2
(
x
＋
2
)
−
1
=
0
(7)
2
(
x
＋
8
)
=
4
(8)
2
(
x
＋
7
)
=
4
(9)
2
(
x
＋
8
)
=
3
(10)
2
(
x
＋
9
)
=
49
(11)
2
(
x
＋
9
)
−
49
=
0
(12)
2
(
x
＋
10
)
=
4
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
5
)
=
4
x
＋
5
=
±
2
x
=
−
5
±
2
x
=
−3
，
−7
(2)
2
(
x
＋
9
)
−
9
=
0
x
＋
9
=
±
3
x
=
−
9
±
3
x
=
−6
，
−12
(3)
2
(
x
＋
7
)
=
1
x
＋
7
=
±
1
x
=
−
7
±
1
x
=
−6
，
−8
(4)
2
(
x
＋
9
)
−
16
=
0
x
＋
9
=
±
4
x
=
−
9
±
4
x
=
−5
，
−13
(5)
2
(
x
−
7
)
−
25
=
0
x
−
7
=
±
5
x
=
7
±
5
x
=
12
，
2
(6)
2
(
x
＋
2
)
−
1
=
0
x
＋
2
=
±
1
x
=
−
2
±
1
x
=
−1
，
−3
(7)
2
(
x
＋
8
)
=
4
x
＋
8
=
±
2
x
=
−
8
±
2
x
=
−6
，
−10
(8)
2
(
x
＋
7
)
=
4
x
＋
7
=
±
2
x
=
−
7
±
2
x
=
−5
，
−9
(9)
2
(
x
＋
8
)
=
3
x
＋
8
3
=
±
x
3
=
−
8
±
(10)
2
(
x
＋
9
)
=
49
x
＋
9
=
±
7
x
=
−
9
±
7
x
=
−2
，
−16
(11)
2
(
x
＋
9
)
−
49
=
0
x
＋
9
=
±
7
x
=
−
9
±
7
x
=
−2
，
−16
(12)
2
(
x
＋
10
)
=
4
x
＋
10
=
±
2
x
=
−
10
±
2
x
=
−8
，
−12