［文字サイズの変更］
▼
▲
©2019 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
＋
3
)
=
4
(2)
2
(
x
−
7
)
−
9
=
0
(3)
2
(
x
＋
8
)
=
25
(4)
2
(
x
−
3
)
=
6
(5)
2
(
x
−
5
)
=
100
(6)
2
(
x
＋
1
)
=
4
(7)
2
(
x
−
4
)
=
3
(8)
2
(
x
−
7
)
−
49
=
0
(9)
2
(
x
＋
3
)
−
25
=
0
(10)
2
(
x
＋
4
)
=
36
(11)
2
(
x
＋
4
)
−
25
=
0
(12)
2
(
x
＋
1
)
=
5
©2019 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
＋
3
)
=
4
x
＋
3
=
±
2
x
=
−
3
±
2
x
=
−1
，
−5
(2)
2
(
x
−
7
)
−
9
=
0
x
−
7
=
±
3
x
=
7
±
3
x
=
10
，
4
(3)
2
(
x
＋
8
)
=
25
x
＋
8
=
±
5
x
=
−
8
±
5
x
=
−3
，
−13
(4)
2
(
x
−
3
)
=
6
x
−
3
6
=
±
x
6
=
3
±
(5)
2
(
x
−
5
)
=
100
x
−
5
=
±
10
x
=
5
±
10
x
=
15
，
−5
(6)
2
(
x
＋
1
)
=
4
x
＋
1
=
±
2
x
=
−
1
±
2
x
=
1
，
−3
(7)
2
(
x
−
4
)
=
3
x
−
4
3
=
±
x
3
=
4
±
(8)
2
(
x
−
7
)
−
49
=
0
x
−
7
=
±
7
x
=
7
±
7
x
=
14
，
0
(9)
2
(
x
＋
3
)
−
25
=
0
x
＋
3
=
±
5
x
=
−
3
±
5
x
=
2
，
−8
(10)
2
(
x
＋
4
)
=
36
x
＋
4
=
±
6
x
=
−
4
±
6
x
=
2
，
−10
(11)
2
(
x
＋
4
)
−
25
=
0
x
＋
4
=
±
5
x
=
−
4
±
5
x
=
1
，
−9
(12)
2
(
x
＋
1
)
=
5
x
＋
1
5
=
±
x
5
=
−
1
±