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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
[225-00]
(1)
2
x
+
6
x
+
8
=
−3
x
−
10
(2)
(
x
−
1
)
(
x
−
7
)
=
4
(
−3
x
+
7
)
(3)
(
x
+
4
)
(
x
+
5
)
=
−7
x
−
43
(4)
(
x
+
5
)
(
x
+
3
)
=
19
x
+
5
(5)
(
x
+
1
)
(
x
+
6
)
=
x
+
46
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
x
+
6
x
+
8
=
−3
x
−
10
2
x
+
9
x
+
18
=
0
(
x
+
6
)
(
x
+
3
)
=
0
x
=
−6
,
−3
(2)
(
x
−
1
)
(
x
−
7
)
=
4
(
−3
x
+
7
)
2
x
−
8
x
+
7
=
−12
x
+
28
2
x
+
4
x
−
21
=
0
(
x
+
7
)
(
x
−
3
)
=
0
x
=
−7
,
3
(3)
(
x
+
4
)
(
x
+
5
)
=
−7
x
−
43
2
x
+
9
x
+
20
=
−7
x
−
43
2
x
+
16
x
+
63
=
0
(
x
+
9
)
(
x
+
7
)
=
0
x
=
−9
,
−7
(4)
(
x
+
5
)
(
x
+
3
)
=
19
x
+
5
2
x
+
8
x
+
15
=
19
x
+
5
2
x
−
11
x
+
10
=
0
(
x
−
10
)
(
x
−
1
)
=
0
x
=
10
,
1
(5)
(
x
+
1
)
(
x
+
6
)
=
x
+
46
2
x
+
7
x
+
6
=
x
+
46
2
x
+
6
x
−
40
=
0
(
x
−
4
)
(
x
+
10
)
=
0
x
=
4
,
−10