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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
[224-00]
(1)
2
3
x
+
18
x
+
24
=
0
(2)
2
3
x
+
54
x
=
−
240
(3)
2
2
x
=
4
x
+
48
(4)
2
3
x
=
12
x
+
36
(5)
2
2
x
=
−
10
x
+
12
(6)
2
3
x
=
−
27
x
+
30
(7)
2
2
x
−
12
x
−
80
=
0
(8)
2
3
x
+
12
x
=
63
(9)
2
3
x
=
9
x
+
54
(10)
2
3
x
+
60
x
+
300
=
0
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
3
x
+
18
x
+
24
=
0
3
(
x
+
4
)
(
x
+
2
)
=
0
x
=
−4
,
−2
(2)
2
3
x
+
54
x
=
−
240
3
(
x
+
10
)
(
x
+
8
)
=
0
x
=
−10
,
−8
(3)
2
2
x
=
4
x
+
48
2
(
x
+
4
)
(
x
−
6
)
=
0
x
=
−4
,
6
(4)
2
3
x
=
12
x
+
36
3
(
x
−
6
)
(
x
+
2
)
=
0
x
=
6
,
−2
(5)
2
2
x
=
−
10
x
+
12
2
(
x
+
6
)
(
x
−
1
)
=
0
x
=
−6
,
1
(6)
2
3
x
=
−
27
x
+
30
3
(
x
−
1
)
(
x
+
10
)
=
0
x
=
1
,
−10
(7)
2
2
x
−
12
x
−
80
=
0
2
(
x
−
10
)
(
x
+
4
)
=
0
x
=
10
,
−4
(8)
2
3
x
+
12
x
=
63
3
(
x
+
7
)
(
x
−
3
)
=
0
x
=
−7
,
3
(9)
2
3
x
=
9
x
+
54
3
(
x
+
3
)
(
x
−
6
)
=
0
x
=
−3
,
6
(10)
2
3
x
+
60
x
+
300
=
0
2
3
(
x
+
10
)
=
0
x
=
−10