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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
[223-00]
(1)
2
x
+
6
x
−
27
=
0
(2)
2
x
=
36
(3)
2
x
+
9
x
+
18
=
0
(4)
2
x
−
7
x
=
18
(5)
2
x
=
−
10
x
−
16
(6)
2
x
−
3
x
−
40
=
0
(7)
2
x
+
8
x
=
−
7
(8)
2
x
=
6
x
−
5
(9)
2
x
=
−
2
x
+
35
(10)
2
x
−
7
x
+
10
=
0
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
x
+
6
x
−
27
=
0
(
x
−
3
)
(
x
+
9
)
=
0
x
=
3
,
−9
(2)
2
x
=
36
(
x
+
6
)
(
x
−
6
)
=
0
x
=
−6
,
6
(3)
2
x
+
9
x
+
18
=
0
(
x
+
6
)
(
x
+
3
)
=
0
x
=
−6
,
−3
(4)
2
x
−
7
x
=
18
(
x
−
9
)
(
x
+
2
)
=
0
x
=
9
,
−2
(5)
2
x
=
−
10
x
−
16
(
x
+
2
)
(
x
+
8
)
=
0
x
=
−2
,
−8
(6)
2
x
−
3
x
−
40
=
0
(
x
+
5
)
(
x
−
8
)
=
0
x
=
−5
,
8
(7)
2
x
+
8
x
=
−
7
(
x
+
7
)
(
x
+
1
)
=
0
x
=
−7
,
−1
(8)
2
x
=
6
x
−
5
(
x
−
5
)
(
x
−
1
)
=
0
x
=
5
,
1
(9)
2
x
=
−
2
x
+
35
(
x
+
7
)
(
x
−
5
)
=
0
x
=
−7
,
5
(10)
2
x
−
7
x
+
10
=
0
(
x
−
5
)
(
x
−
2
)
=
0
x
=
5
,
2