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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)
8
(
−0.5
x
+
2
)
=
18.8
(2)
3
7
48
(
x
−
9
)
=
−
5
4
5
(3)
2
20
−
(
x
+
9
)
=
−
7
7
(4)
1
55
1.5
(
−1.5
x
−
)
=
−
6
4
(5)
−2
(
−0.5
x
+
6
)
=
−2
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
8
(
−0.5
x
+
2
)
=
18.8
−4
x
+
16
=
18.8
−4
x
=
18.8
−
16
x
=
−0.7
(2)
3
7
48
(
x
−
9
)
=
−
5
4
5
21
27
x
−
20
5
48
=
−
5
21
x
20
48
27
=
−
+
5
5
x
=
−4
(3)
2
20
−
(
x
+
9
)
=
−
7
7
2
18
−
x
−
7
7
20
=
−
7
2
−
x
7
20
18
=
−
+
7
7
x
=
1
(4)
1
55
1.5
(
−1.5
x
−
)
=
−
6
4
1
−2.25
x
−
4
55
=
−
4
−2.25
x
55
1
=
−
+
4
4
x
=
6
(5)
−2
(
−0.5
x
+
6
)
=
−2
x
−
12
=
−2
x
=
−2
+
12
x
=
10