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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)
1.7
:
x
+
1.9
=
1.5
:
3
(2)
x
−
2
:
0.9
=
−3
:
−0.3
(3)
1.9
:
x
+
0.9
=
−1
:
−1.6
(4)
−0.1
:
−0.3
=
−1
:
x
−
1.3
(5)
−2
x
:
−0.2
=
−0.8
:
0.04
(6)
−9
:
1
=
−1.4
x
:
−0.28
(7)
1.7
:
8.5
=
x
−
2.1
:
2
(8)
3
:
3.5
=
−1.8
:
−
x
(9)
8
:
−9
=
1.6
:
x
+
0.1
(10)
−2.55
:
1.7
=
x
−
0.6
:
−1
(11)
0.7
:
2.2
=
3.5
:
x
+
1.2
(12)
0.54
:
−0.9
x
=
1
:
0.5
(13)
−0.2
x
:
0.1
=
−0.48
:
0.2
(14)
−0.1
x
:
−1.1
=
−0.2
:
2.2
(15)
−1.4
:
x
+
1.1
=
−7
:
2
(16)
−1.1
x
:
1.32
=
−1.6
:
−1.92
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
1.7
:
x
+
1.9
=
1.5
:
3
1.5
×
(
x
+
1.9
)
=
1.7
×
3
x
+
1.9
=
3.4
x
=
1.5
(2)
x
−
2
:
0.9
=
−3
:
−0.3
−0.3
×
(
x
−
2
)
=
0.9
×
(
−3
)
x
−
2
=
9
x
=
11
(3)
1.9
:
x
+
0.9
=
−1
:
−1.6
−
(
x
+
0.9
)
=
1.9
×
(
−1.6
)
x
+
0.9
=
3.04
x
=
2.14
(4)
−0.1
:
−0.3
=
−1
:
x
−
1.3
−0.1
×
(
x
−
1.3
)
=
−0.3
×
(
−1
)
x
−
1.3
=
−3
x
=
−1.7
(5)
−2
x
:
−0.2
=
−0.8
:
0.04
0.04
×
(
−2
)
x
=
−0.2
×
(
−0.8
)
x
=
−2
(6)
−9
:
1
=
−1.4
x
:
−0.28
−1.4
x
=
−9
×
(
−0.28
)
x
=
−1.8
(7)
1.7
:
8.5
=
x
−
2.1
:
2
8.5
×
(
x
−
2.1
)
=
1.7
×
2
x
−
2.1
=
0.4
x
=
2.5
(8)
3
:
3.5
=
−1.8
:
−
x
3
×
(
−1
)
x
=
3.5
×
(
−1.8
)
x
=
2.1
(9)
8
:
−9
=
1.6
:
x
+
0.1
8
×
(
x
+
0.1
)
=
−9
×
1.6
x
+
0.1
=
−1.8
x
=
−1.9
(10)
−2.55
:
1.7
=
x
−
0.6
:
−1
1.7
×
(
x
−
0.6
)
=
−2.55
×
(
−1
)
x
−
0.6
=
1.5
x
=
2.1
(11)
0.7
:
2.2
=
3.5
:
x
+
1.2
0.7
×
(
x
+
1.2
)
=
2.2
×
3.5
x
+
1.2
=
11
x
=
9.8
(12)
0.54
:
−0.9
x
=
1
:
0.5
−0.9
x
=
0.54
×
0.5
x
=
−0.3
(13)
−0.2
x
:
0.1
=
−0.48
:
0.2
0.2
×
(
−0.2
)
x
=
0.1
×
(
−0.48
)
x
=
1.2
(14)
−0.1
x
:
−1.1
=
−0.2
:
2.2
2.2
×
(
−0.1
)
x
=
−1.1
×
(
−0.2
)
x
=
−1
(15)
−1.4
:
x
+
1.1
=
−7
:
2
−7
×
(
x
+
1.1
)
=
−1.4
×
2
x
+
1.1
=
0.4
x
=
−0.7
(16)
−1.1
x
:
1.32
=
−1.6
:
−1.92
−1.92
×
(
−1.1
)
x
=
1.32
×
(
−1.6
)
x
=
−1