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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)
1
2
4
x
=
6
5
(2)
2
45
−5
x
=
−
16
(3)
2
5
−5
x
=
−
9
(4)
2
9
2
x
=
8
(5)
2
4
−5
x
=
−
5
(6)
2
2
9
−
x
=
−
3
7
(7)
2
−2
x
=
−2
(8)
2
3
x
=
3
(9)
2
−5
x
=
−5
(10)
2
75
3
x
=
49
©2018 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
1
2
x
6
4
=
5
2
x
24
=
5
x
2
30
=
±
5
(2)
2
−5
x
45
=
−
16
2
x
9
=
16
x
3
=
±
4
(3)
2
−5
x
5
=
−
9
2
x
1
=
9
x
1
=
±
3
(4)
2
2
x
9
=
8
2
x
9
=
16
x
3
=
±
4
(5)
2
−5
x
4
=
−
5
2
x
4
=
25
x
2
=
±
5
(6)
2
2
−
x
3
9
=
−
7
2
x
27
=
14
x
3
42
=
±
14
(7)
2
−2
x
=
−2
2
x
=
1
x
=
±
1
(8)
2
3
x
=
3
2
x
=
1
x
=
±
1
(9)
2
−5
x
=
−5
2
x
=
1
x
=
±
1
(10)
2
3
x
75
=
49
2
x
25
=
49
x
5
=
±
7