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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)
−8
x
+
9
81
=
7
7
(2)
3
x
+
7
8
=
−
3
3
(3)
10
x
+
2
=
51
2
(4)
−7
x
+
1
29
=
9
9
(5)
x
+
4
9
=
10
10
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−8
x
+
9
81
=
7
7
−8
x
+
9
=
81
−8
x
=
81
−
9
x
=
−9
(2)
3
x
+
7
8
=
−
3
3
3
x
+
7
=
−8
3
x
=
−8
−
7
x
=
−5
(3)
10
x
+
2
=
51
2
10
x
+
2
=
102
10
x
=
102
−
2
x
=
10
(4)
−7
x
+
1
29
=
9
9
−7
x
+
1
=
29
−7
x
=
29
−
1
x
=
−4
(5)
x
+
4
9
=
10
10
x
+
4
=
9
x
=
9
−
4
x
=
5