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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
:
−1.1
=
x
+
2.2
:
−2.2
(2)
0.5
:
0.1
=
−4.2
:
2.1
x
(3)
1.8
:
−0.8
=
9
:
x
−
0.1
(4)
1.5
:
x
+
0.2
=
0.3
:
−0.4
(5)
1.1
:
11
=
x
−
0.3
:
−21
(6)
1.2
:
−0.8
=
5.4
:
1.8
x
(7)
6.5
:
1.3
=
4.5
:
0.5
x
(8)
1.44
:
x
+
0.9
=
−0.6
:
−0.5
(9)
−0.4
:
−0.4
x
=
1
:
0.3
(10)
10.5
:
8
=
4.41
:
2.1
x
(11)
0.21
:
−4.2
=
−0.14
:
1.4
x
(12)
x
−
1.3
:
−0.9
=
−1
:
0.5
(13)
−0.6
:
2.1
=
−3.9
:
1.3
x
(14)
0.1
x
:
0.16
=
7
:
8
(15)
x
+
0.7
:
1
=
2.1
:
0.1
(16)
2
:
x
+
0.3
=
0.4
:
−0.3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
0.5
:
−1.1
=
x
+
2.2
:
−2.2
−1.1
×
(
x
+
2.2
)
=
0.5
×
(
−2.2
)
x
+
2.2
=
1
x
=
−1.2
(2)
0.5
:
0.1
=
−4.2
:
2.1
x
0.5
×
2.1
x
=
0.1
×
(
−4.2
)
x
=
−0.4
(3)
1.8
:
−0.8
=
9
:
x
−
0.1
1.8
×
(
x
−
0.1
)
=
−0.8
×
9
x
−
0.1
=
−4
x
=
−3.9
(4)
1.5
:
x
+
0.2
=
0.3
:
−0.4
0.3
×
(
x
+
0.2
)
=
1.5
×
(
−0.4
)
x
+
0.2
=
−2
x
=
−2.2
(5)
1.1
:
11
=
x
−
0.3
:
−21
11
×
(
x
−
0.3
)
=
1.1
×
(
−21
)
x
−
0.3
=
−2.1
x
=
−1.8
(6)
1.2
:
−0.8
=
5.4
:
1.8
x
1.2
×
1.8
x
=
−0.8
×
5.4
x
=
−2
(7)
6.5
:
1.3
=
4.5
:
0.5
x
6.5
×
0.5
x
=
1.3
×
4.5
x
=
1.8
(8)
1.44
:
x
+
0.9
=
−0.6
:
−0.5
−0.6
×
(
x
+
0.9
)
=
1.44
×
(
−0.5
)
x
+
0.9
=
1.2
x
=
0.3
(9)
−0.4
:
−0.4
x
=
1
:
0.3
−0.4
x
=
−0.4
×
0.3
x
=
0.3
(10)
10.5
:
8
=
4.41
:
2.1
x
10.5
×
2.1
x
=
8
×
4.41
x
=
1.6
(11)
0.21
:
−4.2
=
−0.14
:
1.4
x
0.21
×
1.4
x
=
−4.2
×
(
−0.14
)
x
=
2
(12)
x
−
1.3
:
−0.9
=
−1
:
0.5
0.5
×
(
x
−
1.3
)
=
−0.9
×
(
−1
)
x
−
1.3
=
1.8
x
=
3.1
(13)
−0.6
:
2.1
=
−3.9
:
1.3
x
−0.6
×
1.3
x
=
2.1
×
(
−3.9
)
x
=
10.5
(14)
0.1
x
:
0.16
=
7
:
8
8
×
0.1
x
=
0.16
×
7
x
=
1.4
(15)
x
+
0.7
:
1
=
2.1
:
0.1
0.1
×
(
x
+
0.7
)
=
2.1
x
+
0.7
=
21
x
=
20.3
(16)
2
:
x
+
0.3
=
0.4
:
−0.3
0.4
×
(
x
+
0.3
)
=
2
×
(
−0.3
)
x
+
0.3
=
−1.5
x
=
−1.8