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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)
5
(
8
x
−
1.9
)
=
270.5
(2)
−9
(
3
x
−
0.2
)
=
15.3
(3)
13
213
−8
(
x
+
1.2
)
=
−
10
10
(4)
5
99
1.8
(
x
+
7
)
=
4
10
(5)
11
−
(
−9
x
+
0.5
)
=
−
4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
5
(
8
x
−
1.9
)
=
270.5
40
x
−
9.5
=
270.5
40
x
=
270.5
+
9.5
x
=
7
(2)
−9
(
3
x
−
0.2
)
=
15.3
−27
x
+
1.8
=
15.3
−27
x
=
15.3
−
1.8
x
=
−0.5
(3)
13
213
−8
(
x
+
1.2
)
=
−
10
10
52
−
x
−
9.6
5
213
=
−
10
52
−
x
5
213
=
−
+
9.6
10
x
9
=
8
(4)
5
99
1.8
(
x
+
7
)
=
4
10
9
x
+
12.6
4
99
=
10
9
x
4
99
=
−
12.6
10
x
6
=
−
5
(5)
11
−
(
−9
x
+
0.5
)
=
−
4
9
x
−
0.5
11
=
−
4
9
x
11
=
−
+
0.5
4
x
1
=
−
4