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©2024 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
−
81
=
0
(2)
2
x
+
3
x
−
10
=
0
(3)
2
x
−
8
x
=
9
(4)
2
x
=
x
+
30
(5)
2
x
=
5
x
+
6
(6)
2
x
−
12
x
=
−
36
(7)
2
x
−
2
x
−
24
=
0
(8)
2
x
−
8
x
=
9
(9)
2
x
−
17
x
+
72
=
0
(10)
2
x
=
−
2
x
+
24
©2024 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
x
−
81
=
0
(
x
+
9
)
(
x
−
9
)
=
0
x
=
−9
,
9
(2)
2
x
+
3
x
−
10
=
0
(
x
−
2
)
(
x
+
5
)
=
0
x
=
2
,
−5
(3)
2
x
−
8
x
=
9
(
x
+
1
)
(
x
−
9
)
=
0
x
=
−1
,
9
(4)
2
x
=
x
+
30
(
x
+
5
)
(
x
−
6
)
=
0
x
=
−5
,
6
(5)
2
x
=
5
x
+
6
(
x
+
1
)
(
x
−
6
)
=
0
x
=
−1
,
6
(6)
2
x
−
12
x
=
−
36
2
(
x
−
6
)
=
0
x
=
6
(7)
2
x
−
2
x
−
24
=
0
(
x
−
6
)
(
x
+
4
)
=
0
x
=
6
,
−4
(8)
2
x
−
8
x
=
9
(
x
+
1
)
(
x
−
9
)
=
0
x
=
−1
,
9
(9)
2
x
−
17
x
+
72
=
0
(
x
−
9
)
(
x
−
8
)
=
0
x
=
9
,
8
(10)
2
x
=
−
2
x
+
24
(
x
+
6
)
(
x
−
4
)
=
0
x
=
−6
,
4