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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)
−6.5
:
−1.3
=
x
+
1.8
:
0.4
(2)
0.3
x
:
0.15
=
−0.6
:
1
(3)
x
−
1.7
:
−1
=
1.5
:
−0.5
(4)
0.8
:
1.9
=
−2
:
−0.5
x
(5)
−1.95
:
−1.5
=
−1.3
:
x
−
1.1
(6)
−1.4
:
2
=
−0.07
:
0.1
x
(7)
x
+
0.6
:
0.8
=
−8.5
:
−1.7
(8)
−0.6
x
:
−4.8
=
0.7
:
1.6
(9)
3.872
:
0.8
x
=
−3.3
:
−1.5
(10)
−0.8
x
:
8.8
=
2.1
:
21
(11)
−0.2
:
−1.9
=
0.2
x
:
−1.9
(12)
−1.19
:
−0.7
x
=
1.1
:
11
(13)
−13
:
x
+
1.3
=
−11
:
−1.1
(14)
−1.8
:
0.36
=
x
−
0.5
:
0.1
(15)
x
−
0.9
:
−1.8
=
−9
:
−1.8
(16)
−0.9
:
0.2
x
=
−0.9
:
1.6
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−6.5
:
−1.3
=
x
+
1.8
:
0.4
−1.3
×
(
x
+
1.8
)
=
−6.5
×
0.4
x
+
1.8
=
2
x
=
0.2
(2)
0.3
x
:
0.15
=
−0.6
:
1
0.3
x
=
0.15
×
(
−0.6
)
x
=
−0.3
(3)
x
−
1.7
:
−1
=
1.5
:
−0.5
−0.5
×
(
x
−
1.7
)
=
−
1.5
x
−
1.7
=
3
x
=
4.7
(4)
0.8
:
1.9
=
−2
:
−0.5
x
0.8
×
(
−0.5
)
x
=
1.9
×
(
−2
)
x
=
9.5
(5)
−1.95
:
−1.5
=
−1.3
:
x
−
1.1
−1.95
×
(
x
−
1.1
)
=
−1.5
×
(
−1.3
)
x
−
1.1
=
−1
x
=
0.1
(6)
−1.4
:
2
=
−0.07
:
0.1
x
−1.4
×
0.1
x
=
2
×
(
−0.07
)
x
=
1
(7)
x
+
0.6
:
0.8
=
−8.5
:
−1.7
−1.7
×
(
x
+
0.6
)
=
0.8
×
(
−8.5
)
x
+
0.6
=
4
x
=
3.4
(8)
−0.6
x
:
−4.8
=
0.7
:
1.6
1.6
×
(
−0.6
)
x
=
−4.8
×
0.7
x
=
3.5
(9)
3.872
:
0.8
x
=
−3.3
:
−1.5
−3.3
×
0.8
x
=
3.872
×
(
−1.5
)
x
=
2.2
(10)
−0.8
x
:
8.8
=
2.1
:
21
21
×
(
−0.8
)
x
=
8.8
×
2.1
x
=
−1.1
(11)
−0.2
:
−1.9
=
0.2
x
:
−1.9
−1.9
×
0.2
x
=
−0.2
×
(
−1.9
)
x
=
−1
(12)
−1.19
:
−0.7
x
=
1.1
:
11
1.1
×
(
−0.7
)
x
=
−1.19
×
11
x
=
17
(13)
−13
:
x
+
1.3
=
−11
:
−1.1
−11
×
(
x
+
1.3
)
=
−13
×
(
−1.1
)
x
+
1.3
=
−1.3
x
=
−2.6
(14)
−1.8
:
0.36
=
x
−
0.5
:
0.1
0.36
×
(
x
−
0.5
)
=
−1.8
×
0.1
x
−
0.5
=
−0.5
x
=
0
(15)
x
−
0.9
:
−1.8
=
−9
:
−1.8
−1.8
×
(
x
−
0.9
)
=
−1.8
×
(
−9
)
x
−
0.9
=
−9
x
=
−8.1
(16)
−0.9
:
0.2
x
=
−0.9
:
1.6
−0.9
×
0.2
x
=
−0.9
×
1.6
x
=
8