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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)
1
4
(
0.8
x
+
4
)
=
−
2
5
(2)
11
1
43
−4
(
x
+
)
=
8
2
6
(3)
1
23
−5
(
0.5
x
−
)
=
2
4
(4)
10
(
−
x
−
0.7
)
=
83
(5)
3
(
−4
x
+
5
)
=
−21
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
1
4
(
0.8
x
+
4
)
=
−
2
5
2
x
+
2
5
4
=
−
5
2
x
5
4
=
−
−
2
5
x
=
−7
(2)
11
1
43
−4
(
x
+
)
=
8
2
6
11
−
x
−
2
2
43
=
6
11
−
x
2
43
=
+
2
6
x
5
=
−
3
(3)
1
23
−5
(
0.5
x
−
)
=
2
4
5
−2.5
x
+
2
23
=
4
−2.5
x
23
5
=
−
4
2
x
13
=
−
10
(4)
10
(
−
x
−
0.7
)
=
83
−10
x
−
7
=
83
−10
x
=
83
+
7
x
=
−9
(5)
3
(
−4
x
+
5
)
=
−21
−12
x
+
15
=
−21
−12
x
=
−21
−
15
x
=
3