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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
20
5
x
=
49
(2)
2
27
3
x
=
49
(3)
2
2
x
=
2
(4)
2
−3
x
=
−3
(5)
2
1
2
x
=
2
(6)
2
−3
x
=
−3
(7)
4
2
x
=
1
3
(8)
2
−
x
=
−1
(9)
1
2
2
x
=
3
7
(10)
2
−2
x
=
−2
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
5
x
20
=
49
2
x
4
=
49
x
2
=
±
7
(2)
2
3
x
27
=
49
2
x
9
=
49
x
3
=
±
7
(3)
2
2
x
=
2
2
x
=
1
x
=
±
1
(4)
2
−3
x
=
−3
2
x
=
1
x
=
±
1
(5)
2
2
x
1
=
2
2
x
1
=
4
x
1
=
±
2
(6)
2
−3
x
=
−3
2
x
=
1
x
=
±
1
(7)
4
2
x
3
=
1
2
x
3
=
4
x
1
3
=
±
2
(8)
2
−
x
=
−1
2
x
=
1
x
=
±
1
(9)
1
2
x
3
2
=
7
2
x
6
=
7
x
42
=
±
7
(10)
2
−2
x
=
−2
2
x
=
1
x
=
±
1