［文字サイズの変更］
▼
▲
©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
9
2
x
=
8
(2)
3
2
x
=
1
7
(3)
7
2
1
x
=
5
2
(4)
2
−5
x
=
−5
(5)
2
2
2
x
=
3
3
(6)
2
27
3
x
=
16
(7)
2
−5
x
=
−5
(8)
2
1
−2
x
=
−
2
(9)
2
2
2
x
=
25
(10)
2
−3
x
=
−3
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
2
x
9
=
8
2
x
9
=
16
x
3
=
±
4
(2)
3
2
x
7
=
1
2
x
7
=
3
x
21
=
±
3
(3)
7
2
x
5
1
=
2
2
x
5
=
14
x
70
=
±
14
(4)
2
−5
x
=
−5
2
x
=
1
x
=
±
1
(5)
2
2
x
3
2
=
3
2
x
=
1
x
=
±
1
(6)
2
3
x
27
=
16
2
x
9
=
16
x
3
=
±
4
(7)
2
−5
x
=
−5
2
x
=
1
x
=
±
1
(8)
2
−2
x
1
=
−
2
2
x
1
=
4
x
1
=
±
2
(9)
2
2
x
2
=
25
2
x
1
=
25
x
1
=
±
5
(10)
2
−3
x
=
−3
2
x
=
1
x
=
±
1