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©2025 数学クラブ http://sugaku.club/
月 日( )
● 次の方程式を解きなさい
[225-00]
(1)
(
x
+
2
)
(
x
+
2
)
=
−4
x
−
3
(2)
2
x
−
5
x
−
9
=
−10
x
−
3
(3)
(
x
+
10
)
(
x
+
1
)
=
5
(
x
+
1
)
(4)
2
x
+
7
x
−
5
=
2
x
+
19
(5)
2
x
−
2
x
+
8
=
16
(
−
x
−
2
)
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
(
x
+
2
)
(
x
+
2
)
=
−4
x
−
3
2
x
+
4
x
+
4
=
−4
x
−
3
2
x
+
8
x
+
7
=
0
(
x
+
7
)
(
x
+
1
)
=
0
x
=
−7
,
−1
(2)
2
x
−
5
x
−
9
=
−10
x
−
3
2
x
+
5
x
−
6
=
0
(
x
−
1
)
(
x
+
6
)
=
0
x
=
1
,
−6
(3)
(
x
+
10
)
(
x
+
1
)
=
5
(
x
+
1
)
2
x
+
11
x
+
10
=
5
x
+
5
2
x
+
6
x
+
5
=
0
(
x
+
1
)
(
x
+
5
)
=
0
x
=
−1
,
−5
(4)
2
x
+
7
x
−
5
=
2
x
+
19
2
x
+
5
x
−
24
=
0
(
x
−
3
)
(
x
+
8
)
=
0
x
=
3
,
−8
(5)
2
x
−
2
x
+
8
=
16
(
−
x
−
2
)
2
x
+
14
x
+
40
=
0
(
x
+
10
)
(
x
+
4
)
=
0
x
=
−10
,
−4