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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)
2.09
:
1.1
x
=
9.5
:
−7
(2)
−4
:
−0.8
=
−1.3
x
:
0.78
(3)
−1.1
x
:
0.198
=
2
:
1.8
(4)
−9
:
8.5
=
x
+
2
:
1.7
(5)
−2
:
−5.5
=
−0.4
:
x
−
2.2
(6)
−0.8
:
x
+
1.3
=
0.96
:
−1.2
(7)
2
:
3.5
=
1.9
x
:
1.33
(8)
−0.72
:
x
−
1.3
=
−0.2
:
0.5
(9)
−1.1
x
:
−1.87
=
1
:
1
(10)
−1.6
:
0.2
=
1.5
x
:
1.5
(11)
−0.26
:
−1.95
=
0.34
:
−1.7
x
(12)
0.8
:
−0.5
x
=
−1.44
:
−1.8
(13)
1.2
x
:
−0.672
=
−2
:
1.6
(14)
−17
:
3
=
x
+
1.7
:
0.3
(15)
11
:
2.2
=
0.7
x
:
−0.84
(16)
−10.5
:
9
=
x
+
0.1
:
1.8
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2.09
:
1.1
x
=
9.5
:
−7
9.5
×
1.1
x
=
2.09
×
(
−7
)
x
=
−1.4
(2)
−4
:
−0.8
=
−1.3
x
:
0.78
−0.8
×
(
−1.3
)
x
=
−4
×
0.78
x
=
−3
(3)
−1.1
x
:
0.198
=
2
:
1.8
1.8
×
(
−1.1
)
x
=
0.198
×
2
x
=
−0.2
(4)
−9
:
8.5
=
x
+
2
:
1.7
8.5
×
(
x
+
2
)
=
−9
×
1.7
x
+
2
=
−1.8
x
=
−3.8
(5)
−2
:
−5.5
=
−0.4
:
x
−
2.2
−2
×
(
x
−
2.2
)
=
−5.5
×
(
−0.4
)
x
−
2.2
=
−1.1
x
=
1.1
(6)
−0.8
:
x
+
1.3
=
0.96
:
−1.2
0.96
×
(
x
+
1.3
)
=
−0.8
×
(
−1.2
)
x
+
1.3
=
1
x
=
−0.3
(7)
2
:
3.5
=
1.9
x
:
1.33
3.5
×
1.9
x
=
2
×
1.33
x
=
0.4
(8)
−0.72
:
x
−
1.3
=
−0.2
:
0.5
−0.2
×
(
x
−
1.3
)
=
−0.72
×
0.5
x
−
1.3
=
1.8
x
=
3.1
(9)
−1.1
x
:
−1.87
=
1
:
1
−1.1
x
=
−1.87
x
=
1.7
(10)
−1.6
:
0.2
=
1.5
x
:
1.5
0.2
×
1.5
x
=
−1.6
×
1.5
x
=
−8
(11)
−0.26
:
−1.95
=
0.34
:
−1.7
x
−0.26
×
(
−1.7
)
x
=
−1.95
×
0.34
x
=
−1.5
(12)
0.8
:
−0.5
x
=
−1.44
:
−1.8
−1.44
×
(
−0.5
)
x
=
0.8
×
(
−1.8
)
x
=
−2
(13)
1.2
x
:
−0.672
=
−2
:
1.6
1.6
×
1.2
x
=
−0.672
×
(
−2
)
x
=
0.7
(14)
−17
:
3
=
x
+
1.7
:
0.3
3
×
(
x
+
1.7
)
=
−17
×
0.3
x
+
1.7
=
−1.7
x
=
−3.4
(15)
11
:
2.2
=
0.7
x
:
−0.84
2.2
×
0.7
x
=
11
×
(
−0.84
)
x
=
−6
(16)
−10.5
:
9
=
x
+
0.1
:
1.8
9
×
(
x
+
0.1
)
=
−10.5
×
1.8
x
+
0.1
=
−2.1
x
=
−2.2