[文字サイズの変更]
▼
▲
©2024 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
−
7
x
−
7
=
−13
x
−
12
(2)
(
x
+
8
)
(
x
+
8
)
=
2
(
3
x
+
20
)
(3)
2
x
−
2
x
+
10
=
25
(4)
(
x
−
1
)
(
x
+
10
)
=
4
(
7
x
−
25
)
(5)
(
x
+
5
)
(
x
+
9
)
=
4
(
4
x
+
11
)
©2024 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
x
−
7
x
−
7
=
−13
x
−
12
2
x
+
6
x
+
5
=
0
(
x
+
1
)
(
x
+
5
)
=
0
x
=
−1
,
−5
(2)
(
x
+
8
)
(
x
+
8
)
=
2
(
3
x
+
20
)
2
x
+
16
x
+
64
=
6
x
+
40
2
x
+
10
x
+
24
=
0
(
x
+
4
)
(
x
+
6
)
=
0
x
=
−4
,
−6
(3)
2
x
−
2
x
+
10
=
25
2
x
−
2
x
−
15
=
0
(
x
−
5
)
(
x
+
3
)
=
0
x
=
5
,
−3
(4)
(
x
−
1
)
(
x
+
10
)
=
4
(
7
x
−
25
)
2
x
+
9
x
−
10
=
28
x
−
100
2
x
−
19
x
+
90
=
0
(
x
−
10
)
(
x
−
9
)
=
0
x
=
10
,
9
(5)
(
x
+
5
)
(
x
+
9
)
=
4
(
4
x
+
11
)
2
x
+
14
x
+
45
=
16
x
+
44
2
x
−
2
x
+
1
=
0
2
(
x
−
1
)
=
0
x
=
1