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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)
−
(
0.3
x
+
7
)
=
−7.6
(2)
5
31
−
(
3
x
−
0.7
)
=
7
2
(3)
−8
(
9
x
+
6
)
=
0
(4)
1
−
(
−2
x
+
8
)
=
−5
4
(5)
17
2
2
(
−2
x
+
)
=
−
9
9
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−
(
0.3
x
+
7
)
=
−7.6
−0.3
x
−
7
=
−7.6
−0.3
x
=
−7.6
+
7
x
=
2
(2)
5
31
−
(
3
x
−
0.7
)
=
7
2
15
1
−
x
+
7
2
31
=
2
15
−
x
7
31
1
=
−
2
2
x
=
−7
(3)
−8
(
9
x
+
6
)
=
0
−72
x
−
48
=
0
−72
x
=
48
x
2
=
−
3
(4)
1
−
(
−2
x
+
8
)
=
−5
4
1
x
−
2
2
=
−5
1
x
2
=
−5
+
2
x
=
−6
(5)
17
2
2
(
−2
x
+
)
=
−
9
9
34
−4
x
+
9
2
=
−
9
−4
x
2
34
=
−
−
9
9
x
=
1