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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
=
2
x
+
15
(2)
2
x
−
x
=
72
(3)
2
x
−
14
x
=
−
49
(4)
2
x
+
4
x
+
3
=
0
(5)
2
x
+
2
x
=
63
(6)
2
x
−
4
x
+
4
=
0
(7)
2
x
+
17
x
+
72
=
0
(8)
2
x
+
11
x
=
−
28
(9)
2
x
−
11
x
+
18
=
0
(10)
2
x
−
2
x
=
80
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
x
=
2
x
+
15
(
x
+
3
)
(
x
−
5
)
=
0
x
=
−3
,
5
(2)
2
x
−
x
=
72
(
x
+
8
)
(
x
−
9
)
=
0
x
=
−8
,
9
(3)
2
x
−
14
x
=
−
49
2
(
x
−
7
)
=
0
x
=
7
(4)
2
x
+
4
x
+
3
=
0
(
x
+
3
)
(
x
+
1
)
=
0
x
=
−3
,
−1
(5)
2
x
+
2
x
=
63
(
x
+
9
)
(
x
−
7
)
=
0
x
=
−9
,
7
(6)
2
x
−
4
x
+
4
=
0
2
(
x
−
2
)
=
0
x
=
2
(7)
2
x
+
17
x
+
72
=
0
(
x
+
9
)
(
x
+
8
)
=
0
x
=
−9
,
−8
(8)
2
x
+
11
x
=
−
28
(
x
+
4
)
(
x
+
7
)
=
0
x
=
−4
,
−7
(9)
2
x
−
11
x
+
18
=
0
(
x
−
2
)
(
x
−
9
)
=
0
x
=
2
,
9
(10)
2
x
−
2
x
=
80
(
x
+
8
)
(
x
−
10
)
=
0
x
=
−8
,
10