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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
−
32
x
+
120
=
0
(2)
2
2
x
+
20
x
+
18
=
0
(3)
2
2
x
+
4
x
−
70
=
0
(4)
2
2
x
+
30
x
+
112
=
0
(5)
2
3
x
+
57
x
=
−
270
(6)
2
3
x
−
3
x
=
216
(7)
2
2
x
=
−
8
x
−
8
(8)
2
2
x
+
28
x
+
90
=
0
(9)
2
2
x
+
22
x
+
36
=
0
(10)
2
2
x
−
12
x
=
32
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
x
−
32
x
+
120
=
0
2
(
x
−
10
)
(
x
−
6
)
=
0
x
=
10
,
6
(2)
2
2
x
+
20
x
+
18
=
0
2
(
x
+
9
)
(
x
+
1
)
=
0
x
=
−9
,
−1
(3)
2
2
x
+
4
x
−
70
=
0
2
(
x
+
7
)
(
x
−
5
)
=
0
x
=
−7
,
5
(4)
2
2
x
+
30
x
+
112
=
0
2
(
x
+
7
)
(
x
+
8
)
=
0
x
=
−7
,
−8
(5)
2
3
x
+
57
x
=
−
270
3
(
x
+
10
)
(
x
+
9
)
=
0
x
=
−10
,
−9
(6)
2
3
x
−
3
x
=
216
3
(
x
−
9
)
(
x
+
8
)
=
0
x
=
9
,
−8
(7)
2
2
x
=
−
8
x
−
8
2
2
(
x
+
2
)
=
0
x
=
−2
(8)
2
2
x
+
28
x
+
90
=
0
2
(
x
+
5
)
(
x
+
9
)
=
0
x
=
−5
,
−9
(9)
2
2
x
+
22
x
+
36
=
0
2
(
x
+
9
)
(
x
+
2
)
=
0
x
=
−9
,
−2
(10)
2
2
x
−
12
x
=
32
2
(
x
−
8
)
(
x
+
2
)
=
0
x
=
8
,
−2