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©2022 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
)
=
25
(2)
2
(
x
＋
10
)
−
9
=
0
(3)
2
(
x
＋
1
)
=
25
(4)
2
(
x
＋
3
)
=
9
(5)
2
(
x
＋
7
)
=
16
(6)
2
(
x
＋
9
)
=
81
(7)
2
(
x
＋
2
)
=
4
(8)
2
(
x
＋
4
)
−
4
=
0
(9)
2
(
x
＋
4
)
−
4
=
0
(10)
2
(
x
＋
1
)
−
36
=
0
(11)
2
(
x
−
5
)
=
64
(12)
2
(
x
＋
1
)
−
1
=
0
©2022 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
(
x
−
7
)
=
25
x
−
7
=
±
5
x
=
7
±
5
x
=
12
，
2
(2)
2
(
x
＋
10
)
−
9
=
0
x
＋
10
=
±
3
x
=
−
10
±
3
x
=
−7
，
−13
(3)
2
(
x
＋
1
)
=
25
x
＋
1
=
±
5
x
=
−
1
±
5
x
=
4
，
−6
(4)
2
(
x
＋
3
)
=
9
x
＋
3
=
±
3
x
=
−
3
±
3
x
=
0
，
−6
(5)
2
(
x
＋
7
)
=
16
x
＋
7
=
±
4
x
=
−
7
±
4
x
=
−3
，
−11
(6)
2
(
x
＋
9
)
=
81
x
＋
9
=
±
9
x
=
−
9
±
9
x
=
0
，
−18
(7)
2
(
x
＋
2
)
=
4
x
＋
2
=
±
2
x
=
−
2
±
2
x
=
0
，
−4
(8)
2
(
x
＋
4
)
−
4
=
0
x
＋
4
=
±
2
x
=
−
4
±
2
x
=
−2
，
−6
(9)
2
(
x
＋
4
)
−
4
=
0
x
＋
4
=
±
2
x
=
−
4
±
2
x
=
−2
，
−6
(10)
2
(
x
＋
1
)
−
36
=
0
x
＋
1
=
±
6
x
=
−
1
±
6
x
=
5
，
−7
(11)
2
(
x
−
5
)
=
64
x
−
5
=
±
8
x
=
5
±
8
x
=
13
，
−3
(12)
2
(
x
＋
1
)
−
1
=
0
x
＋
1
=
±
1
x
=
−
1
±
1
x
=
0
，
−2