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©2026 数学クラブ http://sugaku.club/
月 日（ ）
● 次の方程式を解きなさい
[210-20]
(1)
2
4
−
x
=
−
5
(2)
2
32
−2
x
=
−
49
(3)
2
245
−5
x
=
−
36
(4)
2
5
x
=
5
(5)
3
2
4
x
=
2
3
(6)
6
2
1
x
=
5
3
(7)
2
128
−2
x
=
−
49
(8)
2
2
4
x
=
7
7
(9)
2
192
−3
x
=
−
49
(10)
2
1
−3
x
=
−
3
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
−
x
4
=
−
5
2
x
4
=
5
x
2
5
=
±
5
(2)
2
−2
x
32
=
−
49
2
x
16
=
49
x
4
=
±
7
(3)
2
−5
x
245
=
−
36
2
x
49
=
36
x
7
=
±
6
(4)
2
5
x
=
5
2
x
=
1
x
=
±
1
(5)
3
2
x
2
4
=
3
2
x
8
=
9
x
2
2
=
±
3
(6)
6
2
x
5
1
=
3
2
x
5
=
18
x
1
10
=
±
6
(7)
2
−2
x
128
=
−
49
2
x
64
=
49
x
8
=
±
7
(8)
2
2
x
7
4
=
7
2
x
=
2
x
2
=
±
(9)
2
−3
x
192
=
−
49
2
x
64
=
49
x
8
=
±
7
(10)
2
−3
x
1
=
−
3
2
x
1
=
9
x
1
=
±
3