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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)
x
+
0.3
:
−0.2
=
−9.5
:
−1
(2)
0.8
:
4
=
−1.3
:
x
+
1.1
(3)
x
−
1.9
:
−7
=
−0.4
:
−2
(4)
−0.5
:
−1.2
=
−0.9
x
:
−0.216
(5)
−8.5
:
−11
=
1.7
:
−
x
(6)
−1.7
:
1.9
=
1.2
x
:
22.8
(7)
−0.08
:
−0.2
=
x
−
0.6
:
−0.5
(8)
8.5
:
x
−
2
=
−11
:
−2.2
(9)
4
:
7
=
0.8
:
x
−
0.4
(10)
−1.7
:
1.4
=
x
−
2.1
:
7
(11)
x
+
1.2
:
0.8
=
−1
:
−0.2
(12)
0.8
:
4
=
−0.1
:
x
+
1.3
(13)
x
−
0.4
:
1.7
=
−19
:
17
(14)
−1.3
:
1
=
x
−
0.1
:
−1.2
(15)
1.19
:
x
−
2.1
=
0.7
:
2
(16)
−2.6
:
−2
x
=
6.5
:
−11
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
x
+
0.3
:
−0.2
=
−9.5
:
−1
−
(
x
+
0.3
)
=
−0.2
×
(
−9.5
)
x
+
0.3
=
−1.9
x
=
−2.2
(2)
0.8
:
4
=
−1.3
:
x
+
1.1
0.8
×
(
x
+
1.1
)
=
4
×
(
−1.3
)
x
+
1.1
=
−6.5
x
=
−7.6
(3)
x
−
1.9
:
−7
=
−0.4
:
−2
−2
×
(
x
−
1.9
)
=
−7
×
(
−0.4
)
x
−
1.9
=
−1.4
x
=
0.5
(4)
−0.5
:
−1.2
=
−0.9
x
:
−0.216
−1.2
×
(
−0.9
)
x
=
−0.5
×
(
−0.216
)
x
=
0.1
(5)
−8.5
:
−11
=
1.7
:
−
x
−8.5
×
(
−1
)
x
=
−11
×
1.7
x
=
−2.2
(6)
−1.7
:
1.9
=
1.2
x
:
22.8
1.9
×
1.2
x
=
−1.7
×
22.8
x
=
−17
(7)
−0.08
:
−0.2
=
x
−
0.6
:
−0.5
−0.2
×
(
x
−
0.6
)
=
−0.08
×
(
−0.5
)
x
−
0.6
=
−0.2
x
=
0.4
(8)
8.5
:
x
−
2
=
−11
:
−2.2
−11
×
(
x
−
2
)
=
8.5
×
(
−2.2
)
x
−
2
=
1.7
x
=
3.7
(9)
4
:
7
=
0.8
:
x
−
0.4
4
×
(
x
−
0.4
)
=
7
×
0.8
x
−
0.4
=
1.4
x
=
1.8
(10)
−1.7
:
1.4
=
x
−
2.1
:
7
1.4
×
(
x
−
2.1
)
=
−1.7
×
7
x
−
2.1
=
−8.5
x
=
−6.4
(11)
x
+
1.2
:
0.8
=
−1
:
−0.2
−0.2
×
(
x
+
1.2
)
=
0.8
×
(
−1
)
x
+
1.2
=
4
x
=
2.8
(12)
0.8
:
4
=
−0.1
:
x
+
1.3
0.8
×
(
x
+
1.3
)
=
4
×
(
−0.1
)
x
+
1.3
=
−0.5
x
=
−1.8
(13)
x
−
0.4
:
1.7
=
−19
:
17
17
×
(
x
−
0.4
)
=
1.7
×
(
−19
)
x
−
0.4
=
−1.9
x
=
−1.5
(14)
−1.3
:
1
=
x
−
0.1
:
−1.2
x
−
0.1
=
−1.3
×
(
−1.2
)
x
−
0.1
=
1.56
x
=
1.66
(15)
1.19
:
x
−
2.1
=
0.7
:
2
0.7
×
(
x
−
2.1
)
=
1.19
×
2
x
−
2.1
=
3.4
x
=
5.5
(16)
−2.6
:
−2
x
=
6.5
:
−11
6.5
×
(
−2
)
x
=
−2.6
×
(
−11
)
x
=
−2.2