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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
−
6
x
+
7
=
0
(2)
2
x
+
8
x
+
2
=
0
(3)
2
x
+
7
x
+
3
=
0
(4)
2
x
+
9
x
+
9
=
0
(5)
2
x
−
x
−
1
=
0
(6)
2
x
+
4
x
−
9
=
0
(7)
2
x
+
4
x
−
1
=
0
(8)
2
x
+
9
x
+
4
=
0
(9)
2
x
+
5
x
−
7
=
0
(10)
2
x
+
5
x
−
7
=
0
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
x
−
6
x
+
7
=
0
2
x
−
6
x
+
9
−
9
+
7
=
0
2
(
x
−
3
)
=
2
x
−
3
2
=
±
x
2
=
3
±
(2)
2
x
+
8
x
+
2
=
0
2
x
+
8
x
+
16
−
16
+
2
=
0
2
(
x
+
4
)
=
14
x
+
4
14
=
±
x
14
=
−
4
±
(3)
2
x
+
7
x
+
3
=
0
2
49
49
x
+
7
x
+
−
+
3
4
4
=
0
7
2
(
x
+
)
2
37
=
4
7
x
+
2
1
37
=
±
2
x
7
1
37
=
−
±
2
2
(4)
2
x
+
9
x
+
9
=
0
2
81
81
x
+
9
x
+
−
+
9
4
4
=
0
9
2
(
x
+
)
2
45
=
4
9
x
+
2
3
5
=
±
2
x
9
3
5
=
−
±
2
2
(5)
2
x
−
x
−
1
=
0
2
1
1
x
−
x
+
−
−
1
4
4
=
0
1
2
(
x
−
)
2
5
=
4
1
x
−
2
1
5
=
±
2
x
1
1
5
=
±
2
2
(6)
2
x
+
4
x
−
9
=
0
2
x
+
4
x
+
4
−
4
−
9
=
0
2
(
x
+
2
)
=
13
x
+
2
13
=
±
x
13
=
−
2
±
(7)
2
x
+
4
x
−
1
=
0
2
x
+
4
x
+
4
−
4
−
1
=
0
2
(
x
+
2
)
=
5
x
+
2
5
=
±
x
5
=
−
2
±
(8)
2
x
+
9
x
+
4
=
0
2
81
81
x
+
9
x
+
−
+
4
4
4
=
0
9
2
(
x
+
)
2
65
=
4
9
x
+
2
1
65
=
±
2
x
9
1
65
=
−
±
2
2
(9)
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
(10)
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