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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)
−0.4
(
−7
x
+
5
)
=
−7.6
(2)
5
1
(
−
x
−
3
)
=
0
3
2
(3)
9
(
6
x
−
1.5
)
=
−81
(4)
5
97
−2
(
−3
x
+
)
=
−
4
10
(5)
8
4
24
−1.2
(
x
+
)
=
7
7
7
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−0.4
(
−7
x
+
5
)
=
−7.6
2.8
x
−
2
=
−7.6
2.8
x
=
−7.6
+
2
x
=
−2
(2)
5
1
(
−
x
−
3
)
=
0
3
2
5
−
x
−
5
6
=
0
5
−
x
6
=
5
x
=
−6
(3)
9
(
6
x
−
1.5
)
=
−81
54
x
−
13.5
=
−81
54
x
=
−81
+
13.5
x
=
−1.25
(4)
5
97
−2
(
−3
x
+
)
=
−
4
10
5
6
x
−
2
97
=
−
10
6
x
97
5
=
−
+
10
2
x
6
=
−
5
(5)
8
4
24
−1.2
(
x
+
)
=
7
7
7
48
24
−
x
−
35
35
24
=
7
48
−
x
35
24
24
=
+
7
35
x
=
−3