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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
2
x
+
26
x
+
72
=
0
(2)
2
3
x
−
18
x
−
120
=
0
(3)
2
3
x
=
9
x
+
120
(4)
2
3
x
=
3
x
+
60
(5)
2
2
x
+
32
x
=
−
128
(6)
2
3
x
−
51
x
+
210
=
0
(7)
2
2
x
=
−
24
x
−
40
(8)
2
2
x
−
162
=
0
(9)
2
2
x
−
22
x
=
−
20
(10)
2
3
x
−
27
x
−
30
=
0
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
x
+
26
x
+
72
=
0
2
(
x
+
9
)
(
x
+
4
)
=
0
x
=
−9
,
−4
(2)
2
3
x
−
18
x
−
120
=
0
3
(
x
−
10
)
(
x
+
4
)
=
0
x
=
10
,
−4
(3)
2
3
x
=
9
x
+
120
3
(
x
−
8
)
(
x
+
5
)
=
0
x
=
8
,
−5
(4)
2
3
x
=
3
x
+
60
3
(
x
+
4
)
(
x
−
5
)
=
0
x
=
−4
,
5
(5)
2
2
x
+
32
x
=
−
128
2
2
(
x
+
8
)
=
0
x
=
−8
(6)
2
3
x
−
51
x
+
210
=
0
3
(
x
−
10
)
(
x
−
7
)
=
0
x
=
10
,
7
(7)
2
2
x
=
−
24
x
−
40
2
(
x
+
2
)
(
x
+
10
)
=
0
x
=
−2
,
−10
(8)
2
2
x
−
162
=
0
2
(
x
+
9
)
(
x
−
9
)
=
0
x
=
−9
,
9
(9)
2
2
x
−
22
x
=
−
20
2
(
x
−
10
)
(
x
−
1
)
=
0
x
=
10
,
1
(10)
2
3
x
−
27
x
−
30
=
0
3
(
x
+
1
)
(
x
−
10
)
=
0
x
=
−1
,
10