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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)
78
−6
(
1.2
x
+
3
)
=
−
5
(2)
7
49
−4
(
1.4
x
+
)
=
8
10
(3)
2
(
1.1
x
−
2
)
=
18
(4)
3
326
8
(
−
x
−
8
)
=
−
2
5
(5)
118
2
(
3
x
+
10
)
=
5
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
78
−6
(
1.2
x
+
3
)
=
−
5
−7.2
x
−
18
78
=
−
5
−7.2
x
78
=
−
+
18
5
x
1
=
−
3
(2)
7
49
−4
(
1.4
x
+
)
=
8
10
7
−5.6
x
−
2
49
=
10
−5.6
x
49
7
=
+
10
2
x
3
=
−
2
(3)
2
(
1.1
x
−
2
)
=
18
2.2
x
−
4
=
18
2.2
x
=
18
+
4
x
=
10
(4)
3
326
8
(
−
x
−
8
)
=
−
2
5
−12
x
−
64
326
=
−
5
−12
x
326
=
−
+
64
5
x
1
=
10
(5)
118
2
(
3
x
+
10
)
=
5
6
x
+
20
118
=
5
6
x
118
=
−
20
5
x
3
=
5