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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)
−5
(
1.9
x
+
3
)
=
−72
(2)
−9
(
0.3
x
−
0.5
)
=
−3.6
(3)
−0.6
(
−6
x
+
9
)
=
1.8
(4)
−3
(
1.8
x
+
1.2
)
=
−52.2
(5)
9
(
−1.9
x
−
1.4
)
=
124.2
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−5
(
1.9
x
+
3
)
=
−72
−9.5
x
−
15
=
−72
−9.5
x
=
−72
+
15
x
=
6
(2)
−9
(
0.3
x
−
0.5
)
=
−3.6
−2.7
x
+
4.5
=
−3.6
−2.7
x
=
−3.6
−
4.5
x
=
3
(3)
−0.6
(
−6
x
+
9
)
=
1.8
3.6
x
−
5.4
=
1.8
3.6
x
=
1.8
+
5.4
x
=
2
(4)
−3
(
1.8
x
+
1.2
)
=
−52.2
−5.4
x
−
3.6
=
−52.2
−5.4
x
=
−52.2
+
3.6
x
=
9
(5)
9
(
−1.9
x
−
1.4
)
=
124.2
−17.1
x
−
12.6
=
124.2
−17.1
x
=
124.2
+
12.6
x
=
−8