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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
+
4
x
+
5
=
2
(
x
+
34
)
(2)
(
x
+
10
)
(
x
−
1
)
=
2
(
x
−
8
)
(3)
2
x
+
8
x
+
3
=
3
x
+
17
(4)
2
x
+
9
x
+
2
=
2
(
11
x
−
17
)
(5)
(
x
+
1
)
(
x
+
9
)
=
4
(
x
+
1
)
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
x
+
4
x
+
5
=
2
(
x
+
34
)
2
x
+
2
x
−
63
=
0
(
x
−
7
)
(
x
+
9
)
=
0
x
=
7
,
−9
(2)
(
x
+
10
)
(
x
−
1
)
=
2
(
x
−
8
)
2
x
+
9
x
−
10
=
2
x
−
16
2
x
+
7
x
+
6
=
0
(
x
+
1
)
(
x
+
6
)
=
0
x
=
−1
,
−6
(3)
2
x
+
8
x
+
3
=
3
x
+
17
2
x
+
5
x
−
14
=
0
(
x
+
7
)
(
x
−
2
)
=
0
x
=
−7
,
2
(4)
2
x
+
9
x
+
2
=
2
(
11
x
−
17
)
2
x
−
13
x
+
36
=
0
(
x
−
4
)
(
x
−
9
)
=
0
x
=
4
,
9
(5)
(
x
+
1
)
(
x
+
9
)
=
4
(
x
+
1
)
2
x
+
10
x
+
9
=
4
x
+
4
2
x
+
6
x
+
5
=
0
(
x
+
5
)
(
x
+
1
)
=
0
x
=
−5
,
−1