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©2025 数学クラブ http://sugaku.club/
月 日( )
● 次の比例式を解きなさい
[0G1-10]
(1)
1.8
:
x
−
1.6
=
9
:
−1.5
(2)
x
−
1.1
:
3
=
0.8
:
2
(3)
−0.5
x
:
0.85
=
−13
:
−1.3
(4)
0.8
:
0.88
=
−2
:
x
−
0.1
(5)
−0.16
:
x
+
0.6
=
−0.2
:
−1
(6)
−1.1
x
:
−0.11
=
−1
:
−0.2
(7)
−1.6
x
:
1.76
=
−3
:
−11
(8)
−0.385
:
−1.1
x
=
−0.42
:
0.6
(9)
−10.45
:
1.1
x
=
−1.9
:
−0.4
(10)
0.3
:
−0.2
x
=
−3
:
−3
(11)
1.6
:
8
=
0.7
:
x
−
1
(12)
−0.2
:
−0.1
x
=
1.2
:
0.3
(13)
1.5
:
3
=
1.95
:
−1.3
x
(14)
−22.05
:
2.1
x
=
−9
:
−1.8
(15)
−1.5
:
−0.3
=
−2
x
:
0.4
(16)
1.8
:
−0.7
=
0.5
x
:
−1.75
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
1.8
:
x
−
1.6
=
9
:
−1.5
9
×
(
x
−
1.6
)
=
1.8
×
(
−1.5
)
x
−
1.6
=
−0.3
x
=
1.3
(2)
x
−
1.1
:
3
=
0.8
:
2
2
×
(
x
−
1.1
)
=
3
×
0.8
x
−
1.1
=
1.2
x
=
2.3
(3)
−0.5
x
:
0.85
=
−13
:
−1.3
−1.3
×
(
−0.5
)
x
=
0.85
×
(
−13
)
x
=
−17
(4)
0.8
:
0.88
=
−2
:
x
−
0.1
0.8
×
(
x
−
0.1
)
=
0.88
×
(
−2
)
x
−
0.1
=
−2.2
x
=
−2.1
(5)
−0.16
:
x
+
0.6
=
−0.2
:
−1
−0.2
×
(
x
+
0.6
)
=
−0.16
×
(
−1
)
x
+
0.6
=
−0.8
x
=
−1.4
(6)
−1.1
x
:
−0.11
=
−1
:
−0.2
−0.2
×
(
−1.1
)
x
=
−0.11
×
(
−1
)
x
=
0.5
(7)
−1.6
x
:
1.76
=
−3
:
−11
−11
×
(
−1.6
)
x
=
1.76
×
(
−3
)
x
=
−0.3
(8)
−0.385
:
−1.1
x
=
−0.42
:
0.6
−0.42
×
(
−1.1
)
x
=
−0.385
×
0.6
x
=
−0.5
(9)
−10.45
:
1.1
x
=
−1.9
:
−0.4
−1.9
×
1.1
x
=
−10.45
×
(
−0.4
)
x
=
−2
(10)
0.3
:
−0.2
x
=
−3
:
−3
−3
×
(
−0.2
)
x
=
0.3
×
(
−3
)
x
=
−1.5
(11)
1.6
:
8
=
0.7
:
x
−
1
1.6
×
(
x
−
1
)
=
8
×
0.7
x
−
1
=
3.5
x
=
4.5
(12)
−0.2
:
−0.1
x
=
1.2
:
0.3
1.2
×
(
−0.1
)
x
=
−0.2
×
0.3
x
=
0.5
(13)
1.5
:
3
=
1.95
:
−1.3
x
1.5
×
(
−1.3
)
x
=
3
×
1.95
x
=
−3
(14)
−22.05
:
2.1
x
=
−9
:
−1.8
−9
×
2.1
x
=
−22.05
×
(
−1.8
)
x
=
−2.1
(15)
−1.5
:
−0.3
=
−2
x
:
0.4
−0.3
×
(
−2
)
x
=
−1.5
×
0.4
x
=
−1
(16)
1.8
:
−0.7
=
0.5
x
:
−1.75
−0.7
×
0.5
x
=
1.8
×
(
−1.75
)
x
=
9