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©2025 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
)
=
3
(2)
2
(
x
＋
2
)
−
1
=
0
(3)
2
(
x
＋
4
)
=
3
(4)
2
(
x
＋
7
)
−
49
=
0
(5)
2
(
x
−
1
)
=
100
(6)
2
(
x
＋
10
)
=
9
(7)
2
(
x
＋
9
)
=
1
(8)
2
(
x
−
5
)
=
1
(9)
2
(
x
−
7
)
−
9
=
0
(10)
2
(
x
＋
9
)
=
36
(11)
2
(
x
−
6
)
−
9
=
0
(12)
2
(
x
−
4
)
=
64
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
7
)
=
3
x
＋
7
3
=
±
x
3
=
−
7
±
(2)
2
(
x
＋
2
)
−
1
=
0
x
＋
2
=
±
1
x
=
−
2
±
1
x
=
−1
，
−3
(3)
2
(
x
＋
4
)
=
3
x
＋
4
3
=
±
x
3
=
−
4
±
(4)
2
(
x
＋
7
)
−
49
=
0
x
＋
7
=
±
7
x
=
−
7
±
7
x
=
0
，
−14
(5)
2
(
x
−
1
)
=
100
x
−
1
=
±
10
x
=
1
±
10
x
=
11
，
−9
(6)
2
(
x
＋
10
)
=
9
x
＋
10
=
±
3
x
=
−
10
±
3
x
=
−7
，
−13
(7)
2
(
x
＋
9
)
=
1
x
＋
9
=
±
1
x
=
−
9
±
1
x
=
−8
，
−10
(8)
2
(
x
−
5
)
=
1
x
−
5
=
±
1
x
=
5
±
1
x
=
6
，
4
(9)
2
(
x
−
7
)
−
9
=
0
x
−
7
=
±
3
x
=
7
±
3
x
=
10
，
4
(10)
2
(
x
＋
9
)
=
36
x
＋
9
=
±
6
x
=
−
9
±
6
x
=
−3
，
−15
(11)
2
(
x
−
6
)
−
9
=
0
x
−
6
=
±
3
x
=
6
±
3
x
=
9
，
3
(12)
2
(
x
−
4
)
=
64
x
−
4
=
±
8
x
=
4
±
8
x
=
12
，
−4
