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©2026 数学クラブ http://sugaku.club/
月 日( )
● 次の比例式を解きなさい
[0G1-10]
(1)
0.5
:
0.1
=
−16.8
:
−2.1
x
(2)
−7
:
−2
x
=
2
:
0.4
(3)
0.2
:
1
=
0.4
x
:
3.6
(4)
1.5
:
0.9
=
x
−
1.5
:
0.6
(5)
−0.6
:
−3
=
−0.1
:
x
−
0.6
(6)
0.2
:
1.3
=
1
:
x
+
0.8
(7)
−2.1
:
2
=
0.1
x
:
−0.28
(8)
1.5
:
2.2
=
x
+
1.2
:
1.76
(9)
9.5
:
x
+
0.7
=
1.9
:
1.8
(10)
−1.1
:
−5.5
=
x
+
0.7
:
3
(11)
4
:
0.8
=
−10.5
:
x
+
1.8
(12)
−1.6
:
−8
=
1.3
x
:
9.1
(13)
−0.2
:
−1
=
1.5
x
:
−1.5
(14)
1.9
:
19
=
−1.7
:
x
+
0.9
(15)
−1.2
:
1.2
x
=
1.5
:
−1.8
(16)
−1.5
:
−3
=
2.2
x
:
7.48
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
0.5
:
0.1
=
−16.8
:
−2.1
x
0.5
×
(
−2.1
)
x
=
0.1
×
(
−16.8
)
x
=
1.6
(2)
−7
:
−2
x
=
2
:
0.4
2
×
(
−2
)
x
=
−7
×
0.4
x
=
0.7
(3)
0.2
:
1
=
0.4
x
:
3.6
0.4
x
=
0.2
×
3.6
x
=
1.8
(4)
1.5
:
0.9
=
x
−
1.5
:
0.6
0.9
×
(
x
−
1.5
)
=
1.5
×
0.6
x
−
1.5
=
1
x
=
2.5
(5)
−0.6
:
−3
=
−0.1
:
x
−
0.6
−0.6
×
(
x
−
0.6
)
=
−3
×
(
−0.1
)
x
−
0.6
=
−0.5
x
=
0.1
(6)
0.2
:
1.3
=
1
:
x
+
0.8
0.2
×
(
x
+
0.8
)
=
1.3
x
+
0.8
=
6.5
x
=
5.7
(7)
−2.1
:
2
=
0.1
x
:
−0.28
2
×
0.1
x
=
−2.1
×
(
−0.28
)
x
=
2.94
(8)
1.5
:
2.2
=
x
+
1.2
:
1.76
2.2
×
(
x
+
1.2
)
=
1.5
×
1.76
x
+
1.2
=
1.2
x
=
0
(9)
9.5
:
x
+
0.7
=
1.9
:
1.8
1.9
×
(
x
+
0.7
)
=
9.5
×
1.8
x
+
0.7
=
9
x
=
8.3
(10)
−1.1
:
−5.5
=
x
+
0.7
:
3
−5.5
×
(
x
+
0.7
)
=
−1.1
×
3
x
+
0.7
=
0.6
x
=
−0.1
(11)
4
:
0.8
=
−10.5
:
x
+
1.8
4
×
(
x
+
1.8
)
=
0.8
×
(
−10.5
)
x
+
1.8
=
−2.1
x
=
−3.9
(12)
−1.6
:
−8
=
1.3
x
:
9.1
−8
×
1.3
x
=
−1.6
×
9.1
x
=
1.4
(13)
−0.2
:
−1
=
1.5
x
:
−1.5
−
1.5
x
=
−0.2
×
(
−1.5
)
x
=
−0.2
(14)
1.9
:
19
=
−1.7
:
x
+
0.9
1.9
×
(
x
+
0.9
)
=
19
×
(
−1.7
)
x
+
0.9
=
−17
x
=
−17.9
(15)
−1.2
:
1.2
x
=
1.5
:
−1.8
1.5
×
1.2
x
=
−1.2
×
(
−1.8
)
x
=
1.2
(16)
−1.5
:
−3
=
2.2
x
:
7.48
−3
×
2.2
x
=
−1.5
×
7.48
x
=
1.7