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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
＋
8
)
−
49
=
0
(2)
2
(
x
＋
3
)
−
9
=
0
(3)
2
(
x
−
3
)
−
36
=
0
(4)
2
(
x
−
3
)
=
49
(5)
2
(
x
＋
3
)
−
100
=
0
(6)
2
(
x
＋
6
)
=
1
(7)
2
(
x
＋
1
)
=
5
(8)
2
(
x
＋
6
)
−
1
=
0
(9)
2
(
x
＋
9
)
=
7
(10)
2
(
x
＋
10
)
−
64
=
0
(11)
2
(
x
−
7
)
=
4
(12)
2
(
x
＋
4
)
−
7
=
0
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
8
)
−
49
=
0
x
＋
8
=
±
7
x
=
−
8
±
7
x
=
−1
，
−15
(2)
2
(
x
＋
3
)
−
9
=
0
x
＋
3
=
±
3
x
=
−
3
±
3
x
=
0
，
−6
(3)
2
(
x
−
3
)
−
36
=
0
x
−
3
=
±
6
x
=
3
±
6
x
=
9
，
−3
(4)
2
(
x
−
3
)
=
49
x
−
3
=
±
7
x
=
3
±
7
x
=
10
，
−4
(5)
2
(
x
＋
3
)
−
100
=
0
x
＋
3
=
±
10
x
=
−
3
±
10
x
=
7
，
−13
(6)
2
(
x
＋
6
)
=
1
x
＋
6
=
±
1
x
=
−
6
±
1
x
=
−5
，
−7
(7)
2
(
x
＋
1
)
=
5
x
＋
1
5
=
±
x
5
=
−
1
±
(8)
2
(
x
＋
6
)
−
1
=
0
x
＋
6
=
±
1
x
=
−
6
±
1
x
=
−5
，
−7
(9)
2
(
x
＋
9
)
=
7
x
＋
9
7
=
±
x
7
=
−
9
±
(10)
2
(
x
＋
10
)
−
64
=
0
x
＋
10
=
±
8
x
=
−
10
±
8
x
=
−2
，
−18
(11)
2
(
x
−
7
)
=
4
x
−
7
=
±
2
x
=
7
±
2
x
=
9
，
5
(12)
2
(
x
＋
4
)
−
7
=
0
x
＋
4
7
=
±
x
7
=
−
4
±