[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
[224-00]
(1)
2
3
x
+
12
x
=
15
(2)
2
2
x
−
24
x
+
40
=
0
(3)
2
3
x
−
9
x
+
6
=
0
(4)
2
3
x
=
6
x
+
105
(5)
2
2
x
+
6
x
=
8
(6)
2
2
x
−
24
x
=
−
40
(7)
2
3
x
−
33
x
+
30
=
0
(8)
2
2
x
+
4
x
+
2
=
0
(9)
2
3
x
−
45
x
+
162
=
0
(10)
2
2
x
+
16
x
=
−
24
©2024 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
3
x
+
12
x
=
15
3
(
x
+
5
)
(
x
−
1
)
=
0
x
=
−5
,
1
(2)
2
2
x
−
24
x
+
40
=
0
2
(
x
−
2
)
(
x
−
10
)
=
0
x
=
2
,
10
(3)
2
3
x
−
9
x
+
6
=
0
3
(
x
−
2
)
(
x
−
1
)
=
0
x
=
2
,
1
(4)
2
3
x
=
6
x
+
105
3
(
x
−
7
)
(
x
+
5
)
=
0
x
=
7
,
−5
(5)
2
2
x
+
6
x
=
8
2
(
x
+
4
)
(
x
−
1
)
=
0
x
=
−4
,
1
(6)
2
2
x
−
24
x
=
−
40
2
(
x
−
2
)
(
x
−
10
)
=
0
x
=
2
,
10
(7)
2
3
x
−
33
x
+
30
=
0
3
(
x
−
1
)
(
x
−
10
)
=
0
x
=
1
,
10
(8)
2
2
x
+
4
x
+
2
=
0
2
2
(
x
+
1
)
=
0
x
=
−1
(9)
2
3
x
−
45
x
+
162
=
0
3
(
x
−
9
)
(
x
−
6
)
=
0
x
=
9
,
6
(10)
2
2
x
+
16
x
=
−
24
2
(
x
+
2
)
(
x
+
6
)
=
0
x
=
−2
,
−6