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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
[213-00]
(1)
2
x
+
8
x
−
6
=
0
(2)
2
x
+
5
x
−
10
=
0
(3)
2
x
+
x
−
7
=
0
(4)
2
x
+
x
−
6
=
0
(5)
2
x
+
x
−
2
=
0
(6)
2
x
+
7
x
+
8
=
0
(7)
2
x
+
8
x
−
4
=
0
(8)
2
x
+
6
x
+
8
=
0
(9)
2
x
−
3
x
+
2
=
0
(10)
2
x
−
3
x
−
2
=
0
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
x
+
8
x
−
6
=
0
2
x
+
8
x
+
16
−
16
−
6
=
0
2
(
x
+
4
)
=
22
x
+
4
22
=
±
x
22
=
−
4
±
(2)
2
x
+
5
x
−
10
=
0
2
25
25
x
+
5
x
+
−
−
10
4
4
=
0
5
2
(
x
+
)
2
65
=
4
5
x
+
2
1
65
=
±
2
x
5
1
65
=
−
±
2
2
(3)
2
x
+
x
−
7
=
0
2
1
1
x
+
x
+
−
−
7
4
4
=
0
1
2
(
x
+
)
2
29
=
4
1
x
+
2
1
29
=
±
2
x
1
1
29
=
−
±
2
2
(4)
2
x
+
x
−
6
=
0
2
1
1
x
+
x
+
−
−
6
4
4
=
0
1
2
(
x
+
)
2
25
=
4
1
x
+
2
5
=
±
2
x
=
2
,
−3
(5)
2
x
+
x
−
2
=
0
2
1
1
x
+
x
+
−
−
2
4
4
=
0
1
2
(
x
+
)
2
9
=
4
1
x
+
2
3
=
±
2
x
=
1
,
−2
(6)
2
x
+
7
x
+
8
=
0
2
49
49
x
+
7
x
+
−
+
8
4
4
=
0
7
2
(
x
+
)
2
17
=
4
7
x
+
2
1
17
=
±
2
x
7
1
17
=
−
±
2
2
(7)
2
x
+
8
x
−
4
=
0
2
x
+
8
x
+
16
−
16
−
4
=
0
2
(
x
+
4
)
=
20
x
+
4
5
=
±
2
x
5
=
−
4
±
2
(8)
2
x
+
6
x
+
8
=
0
2
x
+
6
x
+
9
−
9
+
8
=
0
2
(
x
+
3
)
=
1
x
+
3
=
±
1
x
=
−2
,
−4
(9)
2
x
−
3
x
+
2
=
0
2
9
9
x
−
3
x
+
−
+
2
4
4
=
0
3
2
(
x
−
)
2
1
=
4
3
x
−
2
1
=
±
2
x
=
2
,
1
(10)
2
x
−
3
x
−
2
=
0
2
9
9
x
−
3
x
+
−
−
2
4
4
=
0
3
2
(
x
−
)
2
17
=
4
3
x
−
2
1
17
=
±
2
x
3
1
17
=
±
2
2