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©2025 数学クラブ http://sugaku.club/
月 日( )
● 次の方程式を解きなさい
[0E5-30]
(1)
8
(
8
x
−
1.6
)
=
−38.4
(2)
15
63
1.8
(
−
x
−
8
)
=
−
8
4
(3)
7
(
1.1
x
−
3
)
=
−90.3
(4)
1
3
(
2
x
−
1
)
=
2
2
(5)
−0.5
(
−5
x
+
4
)
=
1
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
8
(
8
x
−
1.6
)
=
−38.4
64
x
−
12.8
=
−38.4
64
x
=
−38.4
+
12.8
x
=
−0.4
(2)
15
63
1.8
(
−
x
−
8
)
=
−
8
4
27
−
x
−
14.4
8
63
=
−
4
27
−
x
8
63
=
−
+
14.4
4
x
2
=
5
(3)
7
(
1.1
x
−
3
)
=
−90.3
7.7
x
−
21
=
−90.3
7.7
x
=
−90.3
+
21
x
=
−9
(4)
1
3
(
2
x
−
1
)
=
2
2
1
x
−
2
3
=
2
x
3
1
=
+
2
2
x
=
2
(5)
−0.5
(
−5
x
+
4
)
=
1
2.5
x
−
2
=
1
2.5
x
=
1
+
2
x
=
1.2