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