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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
)
=
16
(2)
2
(
x
＋
7
)
=
10
(3)
2
(
x
＋
8
)
=
5
(4)
2
(
x
＋
5
)
=
3
(5)
2
(
x
＋
3
)
=
25
(6)
2
(
x
＋
5
)
=
1
(7)
2
(
x
＋
8
)
=
100
(8)
2
(
x
＋
9
)
−
1
=
0
(9)
2
(
x
−
3
)
=
49
(10)
2
(
x
＋
10
)
=
16
(11)
2
(
x
−
6
)
=
9
(12)
2
(
x
−
7
)
−
36
=
0
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
5
)
=
16
x
＋
5
=
±
4
x
=
−
5
±
4
x
=
−1
，
−9
(2)
2
(
x
＋
7
)
=
10
x
＋
7
10
=
±
x
10
=
−
7
±
(3)
2
(
x
＋
8
)
=
5
x
＋
8
5
=
±
x
5
=
−
8
±
(4)
2
(
x
＋
5
)
=
3
x
＋
5
3
=
±
x
3
=
−
5
±
(5)
2
(
x
＋
3
)
=
25
x
＋
3
=
±
5
x
=
−
3
±
5
x
=
2
，
−8
(6)
2
(
x
＋
5
)
=
1
x
＋
5
=
±
1
x
=
−
5
±
1
x
=
−4
，
−6
(7)
2
(
x
＋
8
)
=
100
x
＋
8
=
±
10
x
=
−
8
±
10
x
=
2
，
−18
(8)
2
(
x
＋
9
)
−
1
=
0
x
＋
9
=
±
1
x
=
−
9
±
1
x
=
−8
，
−10
(9)
2
(
x
−
3
)
=
49
x
−
3
=
±
7
x
=
3
±
7
x
=
10
，
−4
(10)
2
(
x
＋
10
)
=
16
x
＋
10
=
±
4
x
=
−
10
±
4
x
=
−6
，
−14
(11)
2
(
x
−
6
)
=
9
x
−
6
=
±
3
x
=
6
±
3
x
=
9
，
3
(12)
2
(
x
−
7
)
−
36
=
0
x
−
7
=
±
6
x
=
7
±
6
x
=
13
，
1