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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
=
81
(2)
2
2
x
=
4
x
+
16
(3)
2
2
x
=
26
x
−
80
(4)
2
3
x
−
9
x
−
54
=
0
(5)
2
3
x
=
9
x
+
120
(6)
2
2
x
=
128
(7)
2
2
x
−
20
x
=
−
18
(8)
2
2
x
−
12
x
=
32
(9)
2
3
x
−
9
x
+
6
=
0
(10)
2
3
x
=
36
x
−
108
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
3
x
−
18
x
=
81
3
(
x
+
3
)
(
x
−
9
)
=
0
x
=
−3
,
9
(2)
2
2
x
=
4
x
+
16
2
(
x
−
4
)
(
x
+
2
)
=
0
x
=
4
,
−2
(3)
2
2
x
=
26
x
−
80
2
(
x
−
5
)
(
x
−
8
)
=
0
x
=
5
,
8
(4)
2
3
x
−
9
x
−
54
=
0
3
(
x
+
3
)
(
x
−
6
)
=
0
x
=
−3
,
6
(5)
2
3
x
=
9
x
+
120
3
(
x
+
5
)
(
x
−
8
)
=
0
x
=
−5
,
8
(6)
2
2
x
=
128
2
(
x
−
8
)
(
x
+
8
)
=
0
x
=
8
,
−8
(7)
2
2
x
−
20
x
=
−
18
2
(
x
−
9
)
(
x
−
1
)
=
0
x
=
9
,
1
(8)
2
2
x
−
12
x
=
32
2
(
x
−
8
)
(
x
+
2
)
=
0
x
=
8
,
−2
(9)
2
3
x
−
9
x
+
6
=
0
3
(
x
−
2
)
(
x
−
1
)
=
0
x
=
2
,
1
(10)
2
3
x
=
36
x
−
108
2
3
(
x
−
6
)
=
0
x
=
6