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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
2
x
=
−
6
x
+
20
(2)
2
2
x
−
8
x
+
8
=
0
(3)
2
3
x
+
21
x
−
24
=
0
(4)
2
3
x
+
30
x
+
75
=
0
(5)
2
2
x
=
4
x
+
70
(6)
2
2
x
=
4
x
+
160
(7)
2
3
x
=
−
9
x
+
162
(8)
2
3
x
=
−
9
x
+
30
(9)
2
2
x
+
12
x
=
−
18
(10)
2
3
x
=
45
x
−
162
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
x
=
−
6
x
+
20
2
(
x
+
5
)
(
x
−
2
)
=
0
x
=
−5
,
2
(2)
2
2
x
−
8
x
+
8
=
0
2
2
(
x
−
2
)
=
0
x
=
2
(3)
2
3
x
+
21
x
−
24
=
0
3
(
x
+
8
)
(
x
−
1
)
=
0
x
=
−8
,
1
(4)
2
3
x
+
30
x
+
75
=
0
2
3
(
x
+
5
)
=
0
x
=
−5
(5)
2
2
x
=
4
x
+
70
2
(
x
+
5
)
(
x
−
7
)
=
0
x
=
−5
,
7
(6)
2
2
x
=
4
x
+
160
2
(
x
−
10
)
(
x
+
8
)
=
0
x
=
10
,
−8
(7)
2
3
x
=
−
9
x
+
162
3
(
x
−
6
)
(
x
+
9
)
=
0
x
=
6
,
−9
(8)
2
3
x
=
−
9
x
+
30
3
(
x
−
2
)
(
x
+
5
)
=
0
x
=
2
,
−5
(9)
2
2
x
+
12
x
=
−
18
2
2
(
x
+
3
)
=
0
x
=
−3
(10)
2
3
x
=
45
x
−
162
3
(
x
−
9
)
(
x
−
6
)
=
0
x
=
9
,
6