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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
[0E7-00]
(1)
−7
x
+
7
21
=
−
6
2
(2)
9
x
+
7
25
=
9
9
(3)
8
x
+
6
26
=
9
3
(4)
−7
x
−
8
71
=
−
9
9
(5)
3
x
+
7
17
=
−
10
10
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−7
x
+
7
21
=
−
6
2
−7
x
+
7
=
−63
−7
x
=
−63
−
7
x
=
10
(2)
9
x
+
7
25
=
9
9
9
x
+
7
=
25
9
x
=
25
−
7
x
=
2
(3)
8
x
+
6
26
=
9
3
8
x
+
6
=
78
8
x
=
78
−
6
x
=
9
(4)
−7
x
−
8
71
=
−
9
9
−7
x
−
8
=
−71
−7
x
=
−71
+
8
x
=
9
(5)
3
x
+
7
17
=
−
10
10
3
x
+
7
=
−17
3
x
=
−17
−
7
x
=
−8