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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)
16
115
−10
(
−0.1
x
+
)
=
−
9
9
(2)
1.9
(
4
x
+
9
)
=
−58.9
(3)
9
21
1.5
(
−
x
−
5
)
=
−
10
10
(4)
−4
(
2
x
−
0.7
)
=
18.8
(5)
1
8
(
−2
x
+
)
=
−12
2
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
16
115
−10
(
−0.1
x
+
)
=
−
9
9
160
x
−
9
115
=
−
9
x
115
160
=
−
+
9
9
x
=
5
(2)
1.9
(
4
x
+
9
)
=
−58.9
7.6
x
+
17.1
=
−58.9
7.6
x
=
−58.9
−
17.1
x
=
−10
(3)
9
21
1.5
(
−
x
−
5
)
=
−
10
10
27
−
x
−
7.5
20
21
=
−
10
27
−
x
20
21
=
−
+
7.5
10
x
=
−4
(4)
−4
(
2
x
−
0.7
)
=
18.8
−8
x
+
2.8
=
18.8
−8
x
=
18.8
−
2.8
x
=
−2
(5)
1
8
(
−2
x
+
)
=
−12
2
−16
x
+
4
=
−12
−16
x
=
−12
−
4
x
=
1