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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
:
0.64
=
1.9
x
:
−1.52
(2)
0.42
:
0.7
x
=
0.4
:
2
(3)
0.8
:
x
+
2
=
−1.8
:
−9
(4)
−2
x
:
−1.2
=
5.5
:
1.1
(5)
−6.8
:
−1.7
x
=
0.8
:
1.3
(6)
x
+
1.2
:
1.1
=
−8
:
5.5
(7)
−0.3
:
−3
=
x
−
0.2
:
11
(8)
−8.5
:
6
=
1.6
x
:
1.92
(9)
x
+
0.5
:
−1.9
=
−17
:
−1.7
(10)
11
:
−0.5
=
x
+
0.6
:
−0.1
(11)
−1.2
:
2
=
−1.1
x
:
−1.1
(12)
0.5
:
−1.6
=
−0.1
x
:
−0.096
(13)
−7
:
−9
=
−1.4
:
x
+
2.2
(14)
−1
:
−0.2
=
1.7
x
:
3.57
(15)
−9
:
−1.8
=
x
+
0.6
:
1.3
(16)
x
+
0.4
:
8.5
=
−0.2
:
−1
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
0.4
:
0.64
=
1.9
x
:
−1.52
0.64
×
1.9
x
=
0.4
×
(
−1.52
)
x
=
−0.5
(2)
0.42
:
0.7
x
=
0.4
:
2
0.4
×
0.7
x
=
0.42
×
2
x
=
3
(3)
0.8
:
x
+
2
=
−1.8
:
−9
−1.8
×
(
x
+
2
)
=
0.8
×
(
−9
)
x
+
2
=
4
x
=
2
(4)
−2
x
:
−1.2
=
5.5
:
1.1
1.1
×
(
−2
)
x
=
−1.2
×
5.5
x
=
3
(5)
−6.8
:
−1.7
x
=
0.8
:
1.3
0.8
×
(
−1.7
)
x
=
−6.8
×
1.3
x
=
6.5
(6)
x
+
1.2
:
1.1
=
−8
:
5.5
5.5
×
(
x
+
1.2
)
=
1.1
×
(
−8
)
x
+
1.2
=
−1.6
x
=
−2.8
(7)
−0.3
:
−3
=
x
−
0.2
:
11
−3
×
(
x
−
0.2
)
=
−0.3
×
11
x
−
0.2
=
1.1
x
=
1.3
(8)
−8.5
:
6
=
1.6
x
:
1.92
6
×
1.6
x
=
−8.5
×
1.92
x
=
−1.7
(9)
x
+
0.5
:
−1.9
=
−17
:
−1.7
−1.7
×
(
x
+
0.5
)
=
−1.9
×
(
−17
)
x
+
0.5
=
−19
x
=
−19.5
(10)
11
:
−0.5
=
x
+
0.6
:
−0.1
−0.5
×
(
x
+
0.6
)
=
11
×
(
−0.1
)
x
+
0.6
=
2.2
x
=
1.6
(11)
−1.2
:
2
=
−1.1
x
:
−1.1
2
×
(
−1.1
)
x
=
−1.2
×
(
−1.1
)
x
=
−0.6
(12)
0.5
:
−1.6
=
−0.1
x
:
−0.096
−1.6
×
(
−0.1
)
x
=
0.5
×
(
−0.096
)
x
=
−0.3
(13)
−7
:
−9
=
−1.4
:
x
+
2.2
−7
×
(
x
+
2.2
)
=
−9
×
(
−1.4
)
x
+
2.2
=
−1.8
x
=
−4
(14)
−1
:
−0.2
=
1.7
x
:
3.57
−0.2
×
1.7
x
=
−
3.57
x
=
10.5
(15)
−9
:
−1.8
=
x
+
0.6
:
1.3
−1.8
×
(
x
+
0.6
)
=
−9
×
1.3
x
+
0.6
=
6.5
x
=
5.9
(16)
x
+
0.4
:
8.5
=
−0.2
:
−1
−
(
x
+
0.4
)
=
8.5
×
(
−0.2
)
x
+
0.4
=
1.7
x
=
1.3