［文字サイズの変更］
▼
▲
©2026 数学クラブ http://sugaku.club/
月 日（ ）
● 次の方程式を解きなさい
[213-00]
(1)
2
x
＋
3
x
−
8
=
0
(2)
2
x
−
6
x
−
10
=
0
(3)
2
x
＋
8
x
＋
3
=
0
(4)
2
x
＋
5
x
−
7
=
0
(5)
2
x
＋
5
x
＋
6
=
0
(6)
2
x
−
5
x
＋
5
=
0
(7)
2
x
＋
10
x
＋
8
=
0
(8)
2
x
＋
4
x
−
4
=
0
(9)
2
x
＋
9
x
−
5
=
0
(10)
2
x
＋
10
x
＋
8
=
0
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
x
＋
3
x
−
8
=
0
2
9
9
x
＋
3
x
＋
−
−
8
4
4
=
0
3
2
(
x
＋
)
2
41
=
4
3
x
＋
2
1
41
=
±
2
x
3
1
41
=
−
±
2
2
(2)
2
x
−
6
x
−
10
=
0
2
x
−
6
x
＋
9
−
9
−
10
=
0
2
(
x
−
3
)
=
19
x
−
3
19
=
±
x
19
=
3
±
(3)
2
x
＋
8
x
＋
3
=
0
2
x
＋
8
x
＋
16
−
16
＋
3
=
0
2
(
x
＋
4
)
=
13
x
＋
4
13
=
±
x
13
=
−
4
±
(4)
2
x
＋
5
x
−
7
=
0
2
25
25
x
＋
5
x
＋
−
−
7
4
4
=
0
5
2
(
x
＋
)
2
53
=
4
5
x
＋
2
1
53
=
±
2
x
5
1
53
=
−
±
2
2
(5)
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
(6)
2
x
−
5
x
＋
5
=
0
2
25
25
x
−
5
x
＋
−
＋
5
4
4
=
0
5
2
(
x
−
)
2
5
=
4
5
x
−
2
1
5
=
±
2
x
5
1
5
=
±
2
2
(7)
2
x
＋
10
x
＋
8
=
0
2
x
＋
10
x
＋
25
−
25
＋
8
=
0
2
(
x
＋
5
)
=
17
x
＋
5
17
=
±
x
17
=
−
5
±
(8)
2
x
＋
4
x
−
4
=
0
2
x
＋
4
x
＋
4
−
4
−
4
=
0
2
(
x
＋
2
)
=
8
x
＋
2
2
=
±
2
x
2
=
−
2
±
2
(9)
2
x
＋
9
x
−
5
=
0
2
81
81
x
＋
9
x
＋
−
−
5
4
4
=
0
9
2
(
x
＋
)
2
101
=
4
9
x
＋
2
1
101
=
±
2
x
9
1
101
=
−
±
2
2
(10)
2
x
＋
10
x
＋
8
=
0
2
x
＋
10
x
＋
25
−
25
＋
8
=
0
2
(
x
＋
5
)
=
17
x
＋
5
17
=
±
x
17
=
−
5
±