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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
)
=
5
(2)
2
(
x
＋
9
)
=
4
(3)
2
(
x
−
5
)
=
16
(4)
2
(
x
＋
4
)
=
4
(5)
2
(
x
＋
1
)
=
100
(6)
2
(
x
＋
7
)
=
1
(7)
2
(
x
−
1
)
=
5
(8)
2
(
x
−
3
)
−
9
=
0
(9)
2
(
x
＋
10
)
=
81
(10)
2
(
x
＋
10
)
=
49
(11)
2
(
x
−
4
)
−
7
=
0
(12)
2
(
x
−
6
)
=
81
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
8
)
=
5
x
＋
8
5
=
±
x
5
=
−
8
±
(2)
2
(
x
＋
9
)
=
4
x
＋
9
=
±
2
x
=
−
9
±
2
x
=
−7
，
−11
(3)
2
(
x
−
5
)
=
16
x
−
5
=
±
4
x
=
5
±
4
x
=
9
，
1
(4)
2
(
x
＋
4
)
=
4
x
＋
4
=
±
2
x
=
−
4
±
2
x
=
−2
，
−6
(5)
2
(
x
＋
1
)
=
100
x
＋
1
=
±
10
x
=
−
1
±
10
x
=
9
，
−11
(6)
2
(
x
＋
7
)
=
1
x
＋
7
=
±
1
x
=
−
7
±
1
x
=
−6
，
−8
(7)
2
(
x
−
1
)
=
5
x
−
1
5
=
±
x
5
=
1
±
(8)
2
(
x
−
3
)
−
9
=
0
x
−
3
=
±
3
x
=
3
±
3
x
=
6
，
0
(9)
2
(
x
＋
10
)
=
81
x
＋
10
=
±
9
x
=
−
10
±
9
x
=
−1
，
−19
(10)
2
(
x
＋
10
)
=
49
x
＋
10
=
±
7
x
=
−
10
±
7
x
=
−3
，
−17
(11)
2
(
x
−
4
)
−
7
=
0
x
−
4
7
=
±
x
7
=
4
±
(12)
2
(
x
−
6
)
=
81
x
−
6
=
±
9
x
=
6
±
9
x
=
15
，
−3