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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
)
=
100
(2)
2
(
x
−
4
)
=
64
(3)
2
(
x
−
3
)
−
4
=
0
(4)
2
(
x
＋
6
)
=
8
(5)
2
(
x
＋
9
)
=
4
(6)
2
(
x
＋
7
)
=
4
(7)
2
(
x
−
1
)
=
25
(8)
2
(
x
＋
7
)
=
2
(9)
2
(
x
−
7
)
−
9
=
0
(10)
2
(
x
＋
7
)
=
25
(11)
2
(
x
＋
3
)
−
1
=
0
(12)
2
(
x
−
4
)
−
16
=
0
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
7
)
=
100
x
＋
7
=
±
10
x
=
−
7
±
10
x
=
3
，
−17
(2)
2
(
x
−
4
)
=
64
x
−
4
=
±
8
x
=
4
±
8
x
=
12
，
−4
(3)
2
(
x
−
3
)
−
4
=
0
x
−
3
=
±
2
x
=
3
±
2
x
=
5
，
1
(4)
2
(
x
＋
6
)
=
8
x
＋
6
2
=
±
2
x
2
=
−
6
±
2
(5)
2
(
x
＋
9
)
=
4
x
＋
9
=
±
2
x
=
−
9
±
2
x
=
−7
，
−11
(6)
2
(
x
＋
7
)
=
4
x
＋
7
=
±
2
x
=
−
7
±
2
x
=
−5
，
−9
(7)
2
(
x
−
1
)
=
25
x
−
1
=
±
5
x
=
1
±
5
x
=
6
，
−4
(8)
2
(
x
＋
7
)
=
2
x
＋
7
2
=
±
x
2
=
−
7
±
(9)
2
(
x
−
7
)
−
9
=
0
x
−
7
=
±
3
x
=
7
±
3
x
=
10
，
4
(10)
2
(
x
＋
7
)
=
25
x
＋
7
=
±
5
x
=
−
7
±
5
x
=
−2
，
−12
(11)
2
(
x
＋
3
)
−
1
=
0
x
＋
3
=
±
1
x
=
−
3
±
1
x
=
−2
，
−4
(12)
2
(
x
−
4
)
−
16
=
0
x
−
4
=
±
4
x
=
4
±
4
x
=
8
，
0