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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
[0E5-30]
(1)
2
3
−3
(
−1.8
x
+
)
=
5
2
(2)
7
247
−1.9
(
−
x
−
1.8
)
=
5
10
(3)
−10
(
−1.9
x
+
0.6
)
=
108
(4)
7
49
(
8
x
+
4
)
=
6
3
(5)
1
24
(
x
−
0.4
)
=
2
5
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
3
−3
(
−1.8
x
+
)
=
5
2
6
5.4
x
−
5
3
=
2
5.4
x
3
6
=
+
2
5
x
1
=
2
(2)
7
247
−1.9
(
−
x
−
1.8
)
=
5
10
133
x
+
3.42
50
247
=
10
133
x
50
247
=
−
3.42
10
x
=
8
(3)
−10
(
−1.9
x
+
0.6
)
=
108
19
x
−
6
=
108
19
x
=
108
+
6
x
=
6
(4)
7
49
(
8
x
+
4
)
=
6
3
28
14
x
+
3
3
49
=
3
28
x
3
49
14
=
−
3
3
x
5
=
4
(5)
1
24
(
x
−
0.4
)
=
2
5
1
1
x
−
2
5
24
=
5
1
x
2
24
1
=
+
5
5
x
=
10