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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)
624
−8
(
7
x
−
10
)
=
5
(2)
6
(
1.4
x
+
2
)
=
28.8
(3)
−4
(
4
x
+
5
)
=
−28
(4)
7
(
−8
x
−
2
)
=
378
(5)
5
15
1.8
(
x
−
2
)
=
−
3
2
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
624
−8
(
7
x
−
10
)
=
5
−56
x
+
80
624
=
5
−56
x
624
=
−
80
5
x
4
=
−
5
(2)
6
(
1.4
x
+
2
)
=
28.8
8.4
x
+
12
=
28.8
8.4
x
=
28.8
−
12
x
=
2
(3)
−4
(
4
x
+
5
)
=
−28
−16
x
−
20
=
−28
−16
x
=
−28
+
20
x
1
=
2
(4)
7
(
−8
x
−
2
)
=
378
−56
x
−
14
=
378
−56
x
=
378
+
14
x
=
−7
(5)
5
15
1.8
(
x
−
2
)
=
−
3
2
3
x
−
3.6
15
=
−
2
3
x
15
=
−
+
3.6
2
x
13
=
−
10