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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)
0.9
(
−5
x
−
3
)
=
−47.7
(2)
168
−6
(
5
x
+
1.1
)
=
−
5
(3)
4
3
(
−0.5
x
+
)
=
19
3
(4)
10
(
−9
x
−
1.2
)
=
−192
(5)
1
9
33
(
3
x
−
)
=
4
5
10
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
0.9
(
−5
x
−
3
)
=
−47.7
−4.5
x
−
2.7
=
−47.7
−4.5
x
=
−47.7
+
2.7
x
=
10
(2)
168
−6
(
5
x
+
1.1
)
=
−
5
−30
x
−
6.6
168
=
−
5
−30
x
168
=
−
+
6.6
5
x
9
=
10
(3)
4
3
(
−0.5
x
+
)
=
19
3
−1.5
x
+
4
=
19
−1.5
x
=
19
−
4
x
=
−10
(4)
10
(
−9
x
−
1.2
)
=
−192
−90
x
−
12
=
−192
−90
x
=
−192
+
12
x
=
2
(5)
1
9
33
(
3
x
−
)
=
4
5
10
3
9
x
−
4
20
33
=
10
3
x
4
33
9
=
+
10
20
x
=
5