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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)
x
−
1.5
:
−1
=
1.3
:
−0.2
(2)
4
:
0.8
=
−8.5
:
x
+
1.5
(3)
−1.9
x
:
24.7
=
−0.3
:
−3
(4)
1.8
x
:
0.99
=
−2
:
−0.5
(5)
1.5
:
0.5
=
x
+
2
:
0.6
(6)
x
−
0.8
:
0.3
=
−3
:
−0.9
(7)
1.2
:
6
=
x
−
1
:
−4.5
(8)
x
+
2.2
:
1.6
=
−1
:
−1.6
(9)
5.5
:
1.1
=
x
−
1
:
−1.2
(10)
0.8
:
−1.6
=
1
:
x
+
0.2
(11)
19
:
1.9
=
27.3
:
−2.1
x
(12)
0.6
:
−0.8
=
−5.1
:
−1.7
x
(13)
−1.4
:
x
−
1.5
=
−0.4
:
−2
(14)
−1.7
x
:
18.7
=
0.7
:
−1.1
(15)
1.1
:
11
=
1.3
:
x
−
0.9
(16)
−1.5
:
1.3
=
−3.6
:
1.2
x
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
x
−
1.5
:
−1
=
1.3
:
−0.2
−0.2
×
(
x
−
1.5
)
=
−
1.3
x
−
1.5
=
6.5
x
=
8
(2)
4
:
0.8
=
−8.5
:
x
+
1.5
4
×
(
x
+
1.5
)
=
0.8
×
(
−8.5
)
x
+
1.5
=
−1.7
x
=
−3.2
(3)
−1.9
x
:
24.7
=
−0.3
:
−3
−3
×
(
−1.9
)
x
=
24.7
×
(
−0.3
)
x
=
−1.3
(4)
1.8
x
:
0.99
=
−2
:
−0.5
−0.5
×
1.8
x
=
0.99
×
(
−2
)
x
=
2.2
(5)
1.5
:
0.5
=
x
+
2
:
0.6
0.5
×
(
x
+
2
)
=
1.5
×
0.6
x
+
2
=
1.8
x
=
−0.2
(6)
x
−
0.8
:
0.3
=
−3
:
−0.9
−0.9
×
(
x
−
0.8
)
=
0.3
×
(
−3
)
x
−
0.8
=
1
x
=
1.8
(7)
1.2
:
6
=
x
−
1
:
−4.5
6
×
(
x
−
1
)
=
1.2
×
(
−4.5
)
x
−
1
=
−0.9
x
=
0.1
(8)
x
+
2.2
:
1.6
=
−1
:
−1.6
−1.6
×
(
x
+
2.2
)
=
1.6
×
(
−1
)
x
+
2.2
=
1
x
=
−1.2
(9)
5.5
:
1.1
=
x
−
1
:
−1.2
1.1
×
(
x
−
1
)
=
5.5
×
(
−1.2
)
x
−
1
=
−6
x
=
−5
(10)
0.8
:
−1.6
=
1
:
x
+
0.2
0.8
×
(
x
+
0.2
)
=
−1.6
x
+
0.2
=
−2
x
=
−2.2
(11)
19
:
1.9
=
27.3
:
−2.1
x
19
×
(
−2.1
)
x
=
1.9
×
27.3
x
=
−1.3
(12)
0.6
:
−0.8
=
−5.1
:
−1.7
x
0.6
×
(
−1.7
)
x
=
−0.8
×
(
−5.1
)
x
=
−4
(13)
−1.4
:
x
−
1.5
=
−0.4
:
−2
−0.4
×
(
x
−
1.5
)
=
−1.4
×
(
−2
)
x
−
1.5
=
−7
x
=
−5.5
(14)
−1.7
x
:
18.7
=
0.7
:
−1.1
−1.1
×
(
−1.7
)
x
=
18.7
×
0.7
x
=
7
(15)
1.1
:
11
=
1.3
:
x
−
0.9
1.1
×
(
x
−
0.9
)
=
11
×
1.3
x
−
0.9
=
13
x
=
13.9
(16)
−1.5
:
1.3
=
−3.6
:
1.2
x
−1.5
×
1.2
x
=
1.3
×
(
−3.6
)
x
=
2.6