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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
79
2
(
−1.5
x
−
)
=
3
3
(2)
8
621
9
(
x
+
9
)
=
5
5
(3)
13
1.3
(
6
x
−
4
)
=
−
10
(4)
2
3
(
x
+
5
)
=
21
3
(5)
15
15
(
−1.5
x
+
2
)
=
−
8
2
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
1
79
2
(
−1.5
x
−
)
=
3
3
2
−3
x
−
3
79
=
3
−3
x
79
2
=
+
3
3
x
=
−9
(2)
8
621
9
(
x
+
9
)
=
5
5
72
x
+
81
5
621
=
5
72
x
5
621
=
−
81
5
x
=
3
(3)
13
1.3
(
6
x
−
4
)
=
−
10
7.8
x
−
5.2
13
=
−
10
7.8
x
13
=
−
+
5.2
10
x
1
=
2
(4)
2
3
(
x
+
5
)
=
21
3
2
x
+
15
=
21
2
x
=
21
−
15
x
=
3
(5)
15
15
(
−1.5
x
+
2
)
=
−
8
2
45
15
−
x
+
16
4
15
=
−
2
45
−
x
16
15
15
=
−
−
2
4
x
=
4