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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
＋
4
)
=
3
(2)
2
(
x
＋
10
)
−
1
=
0
(3)
2
(
x
＋
5
)
=
9
(4)
2
(
x
＋
3
)
−
64
=
0
(5)
2
(
x
−
5
)
=
25
(6)
2
(
x
＋
1
)
−
81
=
0
(7)
2
(
x
−
5
)
−
5
=
0
(8)
2
(
x
−
5
)
=
9
(9)
2
(
x
＋
8
)
=
49
(10)
2
(
x
＋
8
)
−
1
=
0
(11)
2
(
x
＋
1
)
−
100
=
0
(12)
2
(
x
＋
4
)
−
9
=
0
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
4
)
=
3
x
＋
4
3
=
±
x
3
=
−
4
±
(2)
2
(
x
＋
10
)
−
1
=
0
x
＋
10
=
±
1
x
=
−
10
±
1
x
=
−9
，
−11
(3)
2
(
x
＋
5
)
=
9
x
＋
5
=
±
3
x
=
−
5
±
3
x
=
−2
，
−8
(4)
2
(
x
＋
3
)
−
64
=
0
x
＋
3
=
±
8
x
=
−
3
±
8
x
=
5
，
−11
(5)
2
(
x
−
5
)
=
25
x
−
5
=
±
5
x
=
5
±
5
x
=
10
，
0
(6)
2
(
x
＋
1
)
−
81
=
0
x
＋
1
=
±
9
x
=
−
1
±
9
x
=
8
，
−10
(7)
2
(
x
−
5
)
−
5
=
0
x
−
5
5
=
±
x
5
=
5
±
(8)
2
(
x
−
5
)
=
9
x
−
5
=
±
3
x
=
5
±
3
x
=
8
，
2
(9)
2
(
x
＋
8
)
=
49
x
＋
8
=
±
7
x
=
−
8
±
7
x
=
−1
，
−15
(10)
2
(
x
＋
8
)
−
1
=
0
x
＋
8
=
±
1
x
=
−
8
±
1
x
=
−7
，
−9
(11)
2
(
x
＋
1
)
−
100
=
0
x
＋
1
=
±
10
x
=
−
1
±
10
x
=
9
，
−11
(12)
2
(
x
＋
4
)
−
9
=
0
x
＋
4
=
±
3
x
=
−
4
±
3
x
=
−1
，
−7