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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
−
7
)
−
16
=
0
(2)
2
(
x
＋
4
)
=
25
(3)
2
(
x
−
3
)
−
100
=
0
(4)
2
(
x
−
1
)
=
10
(5)
2
(
x
＋
2
)
=
36
(6)
2
(
x
−
2
)
−
81
=
0
(7)
2
(
x
＋
9
)
=
9
(8)
2
(
x
−
7
)
−
1
=
0
(9)
2
(
x
＋
4
)
=
16
(10)
2
(
x
＋
4
)
=
16
(11)
2
(
x
＋
3
)
=
9
(12)
2
(
x
＋
2
)
=
7
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
−
7
)
−
16
=
0
x
−
7
=
±
4
x
=
7
±
4
x
=
11
，
3
(2)
2
(
x
＋
4
)
=
25
x
＋
4
=
±
5
x
=
−
4
±
5
x
=
1
，
−9
(3)
2
(
x
−
3
)
−
100
=
0
x
−
3
=
±
10
x
=
3
±
10
x
=
13
，
−7
(4)
2
(
x
−
1
)
=
10
x
−
1
10
=
±
x
10
=
1
±
(5)
2
(
x
＋
2
)
=
36
x
＋
2
=
±
6
x
=
−
2
±
6
x
=
4
，
−8
(6)
2
(
x
−
2
)
−
81
=
0
x
−
2
=
±
9
x
=
2
±
9
x
=
11
，
−7
(7)
2
(
x
＋
9
)
=
9
x
＋
9
=
±
3
x
=
−
9
±
3
x
=
−6
，
−12
(8)
2
(
x
−
7
)
−
1
=
0
x
−
7
=
±
1
x
=
7
±
1
x
=
8
，
6
(9)
2
(
x
＋
4
)
=
16
x
＋
4
=
±
4
x
=
−
4
±
4
x
=
0
，
−8
(10)
2
(
x
＋
4
)
=
16
x
＋
4
=
±
4
x
=
−
4
±
4
x
=
0
，
−8
(11)
2
(
x
＋
3
)
=
9
x
＋
3
=
±
3
x
=
−
3
±
3
x
=
0
，
−6
(12)
2
(
x
＋
2
)
=
7
x
＋
2
7
=
±
x
7
=
−
2
±