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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)
4
−10
(
0.2
x
−
)
=
9
5
(2)
3
8
(
8
x
−
)
=
8
5
(3)
3
−
(
−7
x
+
5
)
=
−39
2
(4)
−10
(
1.4
x
+
1.2
)
=
−26
(5)
8
50
−5
(
x
−
)
=
−
9
9
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
4
−10
(
0.2
x
−
)
=
9
5
−2
x
+
8
=
9
−2
x
=
9
−
8
x
1
=
−
2
(2)
3
8
(
8
x
−
)
=
8
5
24
64
x
−
5
=
8
64
x
24
=
8
+
5
x
1
=
5
(3)
3
−
(
−7
x
+
5
)
=
−39
2
21
15
x
−
2
2
=
−39
21
x
2
15
=
−39
+
2
x
=
−3
(4)
−10
(
1.4
x
+
1.2
)
=
−26
−14
x
−
12
=
−26
−14
x
=
−26
+
12
x
=
1
(5)
8
50
−5
(
x
−
)
=
−
9
9
40
−5
x
+
9
50
=
−
9
−5
x
50
40
=
−
−
9
9
x
=
2