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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)
2
(
−1.1
x
+
8
)
=
29.2
(2)
8
80
(
1.5
x
−
5
)
=
7
7
(3)
5
266
8
(
−
x
+
0.4
)
=
4
5
(4)
0.5
(
−4
x
+
5
)
=
−7.5
(5)
−2
(
−3
x
−
10
)
=
26
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
(
−1.1
x
+
8
)
=
29.2
−2.2
x
+
16
=
29.2
−2.2
x
=
29.2
−
16
x
=
−6
(2)
8
80
(
1.5
x
−
5
)
=
7
7
12
40
x
−
7
7
80
=
7
12
x
7
80
40
=
+
7
7
x
=
10
(3)
5
266
8
(
−
x
+
0.4
)
=
4
5
−10
x
+
3.2
266
=
5
−10
x
266
=
−
3.2
5
x
=
−5
(4)
0.5
(
−4
x
+
5
)
=
−7.5
−2
x
+
2.5
=
−7.5
−2
x
=
−7.5
−
2.5
x
=
5
(5)
−2
(
−3
x
−
10
)
=
26
6
x
+
20
=
26
6
x
=
26
−
20
x
=
1