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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)
10
(
7
x
−
9
)
=
−440
(2)
1
597
−6
(
x
−
9
)
=
2
10
(3)
10
8
8
(
x
−
2
)
=
7
5
7
(4)
−6
(
7
x
−
5
)
=
−33
(5)
5
−2
(
0.2
x
−
0.4
)
=
4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
10
(
7
x
−
9
)
=
−440
70
x
−
90
=
−440
70
x
=
−440
+
90
x
=
−5
(2)
1
597
−6
(
x
−
9
)
=
2
10
−3
x
+
54
597
=
10
−3
x
597
=
−
54
10
x
19
=
−
10
(3)
10
8
8
(
x
−
2
)
=
7
5
7
16
20
x
−
7
7
8
=
7
16
x
7
8
20
=
+
7
7
x
7
=
4
(4)
−6
(
7
x
−
5
)
=
−33
−42
x
+
30
=
−33
−42
x
=
−33
−
30
x
3
=
2
(5)
5
−2
(
0.2
x
−
0.4
)
=
4
−0.4
x
+
0.8
5
=
4
−0.4
x
5
=
−
0.8
4
x
9
=
−
8