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©2025 数学クラブ http://sugaku.club/
月 日( )
● 次の比例式を解きなさい
[0G1-10]
(1)
−0.4
x
:
0.08
=
2
:
−4
(2)
−1.8
:
−9
=
−0.04
:
0.4
x
(3)
−1.7
:
3.23
=
1.3
x
:
2.47
(4)
0.99
:
1.1
x
=
−0.5
:
−1
(5)
2
:
x
−
0.1
=
1
:
0.8
(6)
−7
:
−1.4
=
x
+
1.7
:
−1.6
(7)
2.4
:
−2
x
=
1.5
:
0.5
(8)
−0.9
:
0.9
=
−1
:
x
−
2
(9)
1.5
x
:
−4.5
=
−1.3
:
−1.5
(10)
−1.92
:
1.6
=
0.24
:
0.2
x
(11)
x
+
0.6
:
8.5
=
0.2
:
1.7
(12)
−0.1
:
−0.5
=
0.8
:
x
+
2.1
(13)
−0.7
:
−0.7
=
2
x
:
−14
(14)
−0.8
:
0.2
=
8.8
:
−2.2
x
(15)
3
:
1
=
0.8
x
:
0.4
(16)
1.6
x
:
−0.8
=
−0.2
:
−0.1
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−0.4
x
:
0.08
=
2
:
−4
−4
×
(
−0.4
)
x
=
0.08
×
2
x
=
0.1
(2)
−1.8
:
−9
=
−0.04
:
0.4
x
−1.8
×
0.4
x
=
−9
×
(
−0.04
)
x
=
−0.5
(3)
−1.7
:
3.23
=
1.3
x
:
2.47
3.23
×
1.3
x
=
−1.7
×
2.47
x
=
−1
(4)
0.99
:
1.1
x
=
−0.5
:
−1
−0.5
×
1.1
x
=
0.99
×
(
−1
)
x
=
1.8
(5)
2
:
x
−
0.1
=
1
:
0.8
x
−
0.1
=
2
×
0.8
x
−
0.1
=
1.6
x
=
1.7
(6)
−7
:
−1.4
=
x
+
1.7
:
−1.6
−1.4
×
(
x
+
1.7
)
=
−7
×
(
−1.6
)
x
+
1.7
=
−8
x
=
−9.7
(7)
2.4
:
−2
x
=
1.5
:
0.5
1.5
×
(
−2
)
x
=
2.4
×
0.5
x
=
−0.4
(8)
−0.9
:
0.9
=
−1
:
x
−
2
−0.9
×
(
x
−
2
)
=
0.9
×
(
−1
)
x
−
2
=
1
x
=
3
(9)
1.5
x
:
−4.5
=
−1.3
:
−1.5
−1.5
×
1.5
x
=
−4.5
×
(
−1.3
)
x
=
−2.6
(10)
−1.92
:
1.6
=
0.24
:
0.2
x
−1.92
×
0.2
x
=
1.6
×
0.24
x
=
−1
(11)
x
+
0.6
:
8.5
=
0.2
:
1.7
1.7
×
(
x
+
0.6
)
=
8.5
×
0.2
x
+
0.6
=
1
x
=
0.4
(12)
−0.1
:
−0.5
=
0.8
:
x
+
2.1
−0.1
×
(
x
+
2.1
)
=
−0.5
×
0.8
x
+
2.1
=
4
x
=
1.9
(13)
−0.7
:
−0.7
=
2
x
:
−14
−0.7
×
2
x
=
−0.7
×
(
−14
)
x
=
−7
(14)
−0.8
:
0.2
=
8.8
:
−2.2
x
−0.8
×
(
−2.2
)
x
=
0.2
×
8.8
x
=
1
(15)
3
:
1
=
0.8
x
:
0.4
0.8
x
=
3
×
0.4
x
=
1.5
(16)
1.6
x
:
−0.8
=
−0.2
:
−0.1
−0.1
×
1.6
x
=
−0.8
×
(
−0.2
)
x
=
−1