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©2018 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
3
x
=
5
(2)
2
3
3
x
=
4
(3)
2
3
x
=
3
(4)
2
2
2
x
=
9
(5)
2
−5
x
=
−5
(6)
2
2
x
=
2
(7)
2
8
2
x
=
9
(8)
2
1
−3
x
=
−
3
(9)
2
1
−2
x
=
−
2
(10)
2
27
3
x
=
16
©2018 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
x
3
=
5
x
15
=
±
5
(2)
2
3
x
3
=
4
2
x
1
=
4
x
1
=
±
2
(3)
2
3
x
=
3
2
x
=
1
x
=
±
1
(4)
2
2
x
2
=
9
2
x
1
=
9
x
1
=
±
3
(5)
2
−5
x
=
−5
2
x
=
1
x
=
±
1
(6)
2
2
x
=
2
2
x
=
1
x
=
±
1
(7)
2
2
x
8
=
9
2
x
4
=
9
x
2
=
±
3
(8)
2
−3
x
1
=
−
3
2
x
1
=
9
x
1
=
±
3
(9)
2
−2
x
1
=
−
2
2
x
1
=
4
x
1
=
±
2
(10)
2
3
x
27
=
16
2
x
9
=
16
x
3
=
±
4