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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
=
−
12
x
−
27
(2)
2
x
=
5
x
+
6
(3)
2
x
=
81
(4)
2
x
+
9
x
+
18
=
0
(5)
2
x
−
8
x
+
15
=
0
(6)
2
x
=
x
+
30
(7)
2
x
+
19
x
=
−
90
(8)
2
x
+
5
x
=
50
(9)
2
x
+
13
x
=
−
36
(10)
2
x
+
13
x
+
36
=
0
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
x
=
−
12
x
−
27
(
x
+
3
)
(
x
+
9
)
=
0
x
=
−3
,
−9
(2)
2
x
=
5
x
+
6
(
x
−
6
)
(
x
+
1
)
=
0
x
=
6
,
−1
(3)
2
x
=
81
(
x
−
9
)
(
x
+
9
)
=
0
x
=
9
,
−9
(4)
2
x
+
9
x
+
18
=
0
(
x
+
3
)
(
x
+
6
)
=
0
x
=
−3
,
−6
(5)
2
x
−
8
x
+
15
=
0
(
x
−
5
)
(
x
−
3
)
=
0
x
=
5
,
3
(6)
2
x
=
x
+
30
(
x
−
6
)
(
x
+
5
)
=
0
x
=
6
,
−5
(7)
2
x
+
19
x
=
−
90
(
x
+
10
)
(
x
+
9
)
=
0
x
=
−10
,
−9
(8)
2
x
+
5
x
=
50
(
x
+
10
)
(
x
−
5
)
=
0
x
=
−10
,
5
(9)
2
x
+
13
x
=
−
36
(
x
+
4
)
(
x
+
9
)
=
0
x
=
−4
,
−9
(10)
2
x
+
13
x
+
36
=
0
(
x
+
4
)
(
x
+
9
)
=
0
x
=
−4
,
−9