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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)
3
66
(
9
x
+
10
)
=
4
7
(2)
−
(
−6
x
+
9
)
=
−4.2
(3)
33
−
(
10
x
+
1.7
)
=
10
(4)
2
(
0.9
x
−
1.2
)
=
−4.2
(5)
9
(
−1.2
x
+
8
)
=
158.4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
3
66
(
9
x
+
10
)
=
4
7
27
15
x
+
4
2
66
=
7
27
x
4
66
15
=
−
7
2
x
2
=
7
(2)
−
(
−6
x
+
9
)
=
−4.2
6
x
−
9
=
−4.2
6
x
=
−4.2
+
9
x
=
0.8
(3)
33
−
(
10
x
+
1.7
)
=
10
−10
x
−
1.7
33
=
10
−10
x
33
=
+
1.7
10
x
1
=
−
2
(4)
2
(
0.9
x
−
1.2
)
=
−4.2
1.8
x
−
2.4
=
−4.2
1.8
x
=
−4.2
+
2.4
x
=
−1
(5)
9
(
−1.2
x
+
8
)
=
158.4
−10.8
x
+
72
=
158.4
−10.8
x
=
158.4
−
72
x
=
−8