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