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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
:
−0.4
=
2
:
x
−
1.4
(2)
1.2
:
0.36
=
0.5
:
x
+
1.4
(3)
−0.7
:
−1.3
=
−2.8
:
0.4
x
(4)
x
+
1.4
:
2
=
−0.72
:
1.6
(5)
0.5
:
1.5
=
0.16
:
0.8
x
(6)
8.4
:
−1.2
x
=
−0.7
:
1.1
(7)
−5.04
:
−1.2
x
=
−3
:
−1.5
(8)
0.5
:
0.1
=
x
+
2.2
:
−1.2
(9)
1
:
x
+
1.8
=
0.5
:
−0.3
(10)
−0.1
:
x
−
1.7
=
−1
:
−21
(11)
−3.5
:
x
+
0.4
=
−0.7
:
−0.8
(12)
4.5
:
1.5
x
=
0.3
:
−1.1
(13)
−1.9
:
0.8
=
−9.5
:
x
+
0.7
(14)
9
:
7
=
1.08
:
0.6
x
(15)
1.4
x
:
−5.6
=
−1.7
:
−8.5
(16)
x
−
0.3
:
1.3
=
−21
:
13
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
0.4
:
−0.4
=
2
:
x
−
1.4
0.4
×
(
x
−
1.4
)
=
−0.4
×
2
x
−
1.4
=
−2
x
=
−0.6
(2)
1.2
:
0.36
=
0.5
:
x
+
1.4
1.2
×
(
x
+
1.4
)
=
0.36
×
0.5
x
+
1.4
=
0.15
x
=
−1.25
(3)
−0.7
:
−1.3
=
−2.8
:
0.4
x
−0.7
×
0.4
x
=
−1.3
×
(
−2.8
)
x
=
−13
(4)
x
+
1.4
:
2
=
−0.72
:
1.6
1.6
×
(
x
+
1.4
)
=
2
×
(
−0.72
)
x
+
1.4
=
−0.9
x
=
−2.3
(5)
0.5
:
1.5
=
0.16
:
0.8
x
0.5
×
0.8
x
=
1.5
×
0.16
x
=
0.6
(6)
8.4
:
−1.2
x
=
−0.7
:
1.1
−0.7
×
(
−1.2
)
x
=
8.4
×
1.1
x
=
11
(7)
−5.04
:
−1.2
x
=
−3
:
−1.5
−3
×
(
−1.2
)
x
=
−5.04
×
(
−1.5
)
x
=
2.1
(8)
0.5
:
0.1
=
x
+
2.2
:
−1.2
0.1
×
(
x
+
2.2
)
=
0.5
×
(
−1.2
)
x
+
2.2
=
−6
x
=
−8.2
(9)
1
:
x
+
1.8
=
0.5
:
−0.3
0.5
×
(
x
+
1.8
)
=
−0.3
x
+
1.8
=
−0.6
x
=
−2.4
(10)
−0.1
:
x
−
1.7
=
−1
:
−21
−
(
x
−
1.7
)
=
−0.1
×
(
−21
)
x
−
1.7
=
−2.1
x
=
−0.4
(11)
−3.5
:
x
+
0.4
=
−0.7
:
−0.8
−0.7
×
(
x
+
0.4
)
=
−3.5
×
(
−0.8
)
x
+
0.4
=
−4
x
=
−4.4
(12)
4.5
:
1.5
x
=
0.3
:
−1.1
0.3
×
1.5
x
=
4.5
×
(
−1.1
)
x
=
−11
(13)
−1.9
:
0.8
=
−9.5
:
x
+
0.7
−1.9
×
(
x
+
0.7
)
=
0.8
×
(
−9.5
)
x
+
0.7
=
4
x
=
3.3
(14)
9
:
7
=
1.08
:
0.6
x
9
×
0.6
x
=
7
×
1.08
x
=
1.4
(15)
1.4
x
:
−5.6
=
−1.7
:
−8.5
−8.5
×
1.4
x
=
−5.6
×
(
−1.7
)
x
=
−0.8
(16)
x
−
0.3
:
1.3
=
−21
:
13
13
×
(
x
−
0.3
)
=
1.3
×
(
−21
)
x
−
0.3
=
−2.1
x
=
−1.8