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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)
6
(
−5
x
+
4
)
=
69
(2)
5
1
3
15
(
x
+
)
=
8
2
2
8
(3)
3
4
240
3
(
−
x
−
)
=
2
7
7
(4)
1.3
(
0.9
x
+
0.6
)
=
7.8
(5)
−1.3
(
8
x
+
0.9
)
=
−3.25
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
6
(
−5
x
+
4
)
=
69
−30
x
+
24
=
69
−30
x
=
69
−
24
x
3
=
−
2
(2)
5
1
3
15
(
x
+
)
=
8
2
2
8
5
15
x
+
16
16
15
=
8
5
x
16
15
15
=
−
8
16
x
=
3
(3)
3
4
240
3
(
−
x
−
)
=
2
7
7
9
12
−
x
−
2
7
240
=
7
9
−
x
2
240
12
=
+
7
7
x
=
−8
(4)
1.3
(
0.9
x
+
0.6
)
=
7.8
1.17
x
+
0.78
=
7.8
1.17
x
=
7.8
−
0.78
x
=
6
(5)
−1.3
(
8
x
+
0.9
)
=
−3.25
−10.4
x
−
1.17
=
−3.25
−10.4
x
=
−3.25
+
1.17
x
=
0.2