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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
[224-00]
(1)
2
3
x
+
30
x
=
−
72
(2)
2
3
x
−
3
=
0
(3)
2
3
x
+
39
x
+
126
=
0
(4)
2
3
x
−
15
x
=
42
(5)
2
2
x
−
22
x
=
−
20
(6)
2
2
x
+
20
x
=
−
48
(7)
2
2
x
+
2
x
−
24
=
0
(8)
2
2
x
=
2
x
+
24
(9)
2
3
x
−
51
x
+
216
=
0
(10)
2
3
x
+
51
x
+
216
=
0
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
3
x
+
30
x
=
−
72
3
(
x
+
6
)
(
x
+
4
)
=
0
x
=
−6
,
−4
(2)
2
3
x
−
3
=
0
3
(
x
−
1
)
(
x
+
1
)
=
0
x
=
1
,
−1
(3)
2
3
x
+
39
x
+
126
=
0
3
(
x
+
6
)
(
x
+
7
)
=
0
x
=
−6
,
−7
(4)
2
3
x
−
15
x
=
42
3
(
x
−
7
)
(
x
+
2
)
=
0
x
=
7
,
−2
(5)
2
2
x
−
22
x
=
−
20
2
(
x
−
1
)
(
x
−
10
)
=
0
x
=
1
,
10
(6)
2
2
x
+
20
x
=
−
48
2
(
x
+
6
)
(
x
+
4
)
=
0
x
=
−6
,
−4
(7)
2
2
x
+
2
x
−
24
=
0
2
(
x
−
3
)
(
x
+
4
)
=
0
x
=
3
,
−4
(8)
2
2
x
=
2
x
+
24
2
(
x
+
3
)
(
x
−
4
)
=
0
x
=
−3
,
4
(9)
2
3
x
−
51
x
+
216
=
0
3
(
x
−
9
)
(
x
−
8
)
=
0
x
=
9
,
8
(10)
2
3
x
+
51
x
+
216
=
0
3
(
x
+
9
)
(
x
+
8
)
=
0
x
=
−9
,
−8