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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
[212-00]
(1)
2
x
−
6
x
−
27
=
0
(2)
2
x
−
2
x
＋
1
=
0
(3)
2
x
＋
8
x
＋
7
=
0
(4)
2
x
＋
7
x
＋
12
=
0
(5)
2
x
＋
11
x
＋
28
=
0
(6)
2
x
−
10
x
＋
9
=
0
(7)
2
x
−
4
x
−
21
=
0
(8)
2
x
＋
2
x
−
24
=
0
(9)
2
x
＋
3
x
−
70
=
0
(10)
2
x
＋
6
x
−
27
=
0
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
x
−
6
x
−
27
=
0
2
x
−
6
x
＋
9
−
9
−
27
=
0
2
(
x
−
3
)
=
36
x
−
3
=
±
6
x
=
9
，
−3
(2)
2
x
−
2
x
＋
1
=
0
2
(
x
−
1
)
=
0
x
=
1
(3)
2
x
＋
8
x
＋
7
=
0
2
x
＋
8
x
＋
16
−
16
＋
7
=
0
2
(
x
＋
4
)
=
9
x
＋
4
=
±
3
x
=
−7
，
−1
(4)
2
x
＋
7
x
＋
12
=
0
2
49
49
x
＋
7
x
＋
−
＋
12
4
4
=
0
7
2
(
x
＋
)
2
1
=
4
7
x
＋
2
1
=
±
2
x
=
−4
，
−3
(5)
2
x
＋
11
x
＋
28
=
0
2
121
121
x
＋
11
x
＋
−
＋
28
4
4
=
0
11
2
(
x
＋
)
2
9
=
4
11
x
＋
2
3
=
±
2
x
=
−4
，
−7
(6)
2
x
−
10
x
＋
9
=
0
2
x
−
10
x
＋
25
−
25
＋
9
=
0
2
(
x
−
5
)
=
16
x
−
5
=
±
4
x
=
1
，
9
(7)
2
x
−
4
x
−
21
=
0
2
x
−
4
x
＋
4
−
4
−
21
=
0
2
(
x
−
2
)
=
25
x
−
2
=
±
5
x
=
−3
，
7
(8)
2
x
＋
2
x
−
24
=
0
2
x
＋
2
x
＋
1
−
1
−
24
=
0
2
(
x
＋
1
)
=
25
x
＋
1
=
±
5
x
=
−6
，
4
(9)
2
x
＋
3
x
−
70
=
0
2
9
9
x
＋
3
x
＋
−
−
70
4
4
=
0
3
2
(
x
＋
)
2
289
=
4
3
x
＋
2
17
=
±
2
x
=
7
，
−10
(10)
2
x
＋
6
x
−
27
=
0
2
x
＋
6
x
＋
9
−
9
−
27
=
0
2
(
x
＋
3
)
=
36
x
＋
3
=
±
6
x
=
−9
，
3