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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
91
(
x
+
1.8
)
=
3
3
135
(2)
8
68
9
(
10
x
−
)
=
7
7
(3)
−
(
−7
x
−
0.5
)
=
−27.5
(4)
2
−9
(
−0.8
x
+
)
=
10
9
(5)
−5
(
−3
x
−
1.7
)
=
7
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
1
4
91
(
x
+
1.8
)
=
3
3
135
4
3
x
+
9
5
91
=
135
4
x
9
91
3
=
−
135
5
x
1
=
6
(2)
8
68
9
(
10
x
−
)
=
7
7
72
90
x
−
7
68
=
7
90
x
68
72
=
+
7
7
x
2
=
9
(3)
−
(
−7
x
−
0.5
)
=
−27.5
7
x
+
0.5
=
−27.5
7
x
=
−27.5
−
0.5
x
=
−4
(4)
2
−9
(
−0.8
x
+
)
=
10
9
7.2
x
−
2
=
10
7.2
x
=
10
+
2
x
5
=
3
(5)
−5
(
−3
x
−
1.7
)
=
7
15
x
+
8.5
=
7
15
x
=
7
−
8.5
x
=
−0.1