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©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
+
18
x
=
21
(2)
2
2
x
=
−
6
x
+
20
(3)
2
2
x
+
6
x
=
36
(4)
2
2
x
=
128
(5)
2
3
x
−
6
x
−
189
=
0
(6)
2
2
x
+
4
x
−
48
=
0
(7)
2
2
x
=
4
x
+
126
(8)
2
2
x
+
16
x
=
−
32
(9)
2
3
x
−
6
x
=
72
(10)
2
3
x
=
12
x
−
12
©2024 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
3
x
+
18
x
=
21
3
(
x
+
7
)
(
x
−
1
)
=
0
x
=
−7
,
1
(2)
2
2
x
=
−
6
x
+
20
2
(
x
−
2
)
(
x
+
5
)
=
0
x
=
2
,
−5
(3)
2
2
x
+
6
x
=
36
2
(
x
+
6
)
(
x
−
3
)
=
0
x
=
−6
,
3
(4)
2
2
x
=
128
2
(
x
+
8
)
(
x
−
8
)
=
0
x
=
−8
,
8
(5)
2
3
x
−
6
x
−
189
=
0
3
(
x
+
7
)
(
x
−
9
)
=
0
x
=
−7
,
9
(6)
2
2
x
+
4
x
−
48
=
0
2
(
x
−
4
)
(
x
+
6
)
=
0
x
=
4
,
−6
(7)
2
2
x
=
4
x
+
126
2
(
x
−
9
)
(
x
+
7
)
=
0
x
=
9
,
−7
(8)
2
2
x
+
16
x
=
−
32
2
2
(
x
+
4
)
=
0
x
=
−4
(9)
2
3
x
−
6
x
=
72
3
(
x
−
6
)
(
x
+
4
)
=
0
x
=
6
,
−4
(10)
2
3
x
=
12
x
−
12
2
3
(
x
−
2
)
=
0
x
=
2