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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
[210-20]
(1)
2
−5
x
=
−5
(2)
2
5
5
x
=
4
(3)
2
12
−3
x
=
−
25
(4)
2
5
−5
x
=
−
16
(5)
6
2
1
x
=
5
2
(6)
1
2
5
x
=
2
4
(7)
2
3
3
x
=
4
(8)
2
32
−2
x
=
−
49
(9)
2
1
−
x
=
−
5
(10)
2
80
−5
x
=
−
9
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
−5
x
=
−5
2
x
=
1
x
=
±
1
(2)
2
5
x
5
=
4
2
x
1
=
4
x
1
=
±
2
(3)
2
−3
x
12
=
−
25
2
x
4
=
25
x
2
=
±
5
(4)
2
−5
x
5
=
−
16
2
x
1
=
16
x
1
=
±
4
(5)
6
2
x
5
1
=
2
2
x
5
=
12
x
1
15
=
±
6
(6)
1
2
x
2
5
=
4
2
x
5
=
2
x
10
=
±
2
(7)
2
3
x
3
=
4
2
x
1
=
4
x
1
=
±
2
(8)
2
−2
x
32
=
−
49
2
x
16
=
49
x
4
=
±
7
(9)
2
−
x
1
=
−
5
2
x
1
=
5
x
5
=
±
5
(10)
2
−5
x
80
=
−
9
2
x
16
=
9
x
4
=
±
3