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©2024 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
＋
9
x
＋
14
=
0
(2)
2
x
−
5
x
−
24
=
0
(3)
2
x
＋
x
−
42
=
0
(4)
2
x
＋
11
x
＋
18
=
0
(5)
2
x
−
6
x
−
16
=
0
(6)
2
x
＋
2
x
−
8
=
0
(7)
2
x
＋
5
x
＋
6
=
0
(8)
2
x
−
5
x
＋
6
=
0
(9)
2
x
＋
8
x
−
9
=
0
(10)
2
x
−
10
x
＋
21
=
0
©2024 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
x
＋
9
x
＋
14
=
0
2
81
81
x
＋
9
x
＋
−
＋
14
4
4
=
0
9
2
(
x
＋
)
2
25
=
4
9
x
＋
2
5
=
±
2
x
=
−7
，
−2
(2)
2
x
−
5
x
−
24
=
0
2
25
25
x
−
5
x
＋
−
−
24
4
4
=
0
5
2
(
x
−
)
2
121
=
4
5
x
−
2
11
=
±
2
x
=
−3
，
8
(3)
2
x
＋
x
−
42
=
0
2
1
1
x
＋
x
＋
−
−
42
4
4
=
0
1
2
(
x
＋
)
2
169
=
4
1
x
＋
2
13
=
±
2
x
=
6
，
−7
(4)
2
x
＋
11
x
＋
18
=
0
2
121
121
x
＋
11
x
＋
−
＋
18
4
4
=
0
11
2
(
x
＋
)
2
49
=
4
11
x
＋
2
7
=
±
2
x
=
−9
，
−2
(5)
2
x
−
6
x
−
16
=
0
2
x
−
6
x
＋
9
−
9
−
16
=
0
2
(
x
−
3
)
=
25
x
−
3
=
±
5
x
=
−2
，
8
(6)
2
x
＋
2
x
−
8
=
0
2
x
＋
2
x
＋
1
−
1
−
8
=
0
2
(
x
＋
1
)
=
9
x
＋
1
=
±
3
x
=
−4
，
2
(7)
2
x
＋
5
x
＋
6
=
0
2
25
25
x
＋
5
x
＋
−
＋
6
4
4
=
0
5
2
(
x
＋
)
2
1
=
4
5
x
＋
2
1
=
±
2
x
=
−2
，
−3
(8)
2
x
−
5
x
＋
6
=
0
2
25
25
x
−
5
x
＋
−
＋
6
4
4
=
0
5
2
(
x
−
)
2
1
=
4
5
x
−
2
1
=
±
2
x
=
2
，
3
(9)
2
x
＋
8
x
−
9
=
0
2
x
＋
8
x
＋
16
−
16
−
9
=
0
2
(
x
＋
4
)
=
25
x
＋
4
=
±
5
x
=
1
，
−9
(10)
2
x
−
10
x
＋
21
=
0
2
x
−
10
x
＋
25
−
25
＋
21
=
0
2
(
x
−
5
)
=
4
x
−
5
=
±
2
x
=
7
，
3