[文字サイズの変更]
▼
▲
©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)
1.7
:
8.5
=
0.4
:
x
−
0.1
(2)
−0.24
:
0.3
x
=
−0.8
:
−4
(3)
−1.5
:
0.4
=
x
−
0.1
:
0.8
(4)
3.6
:
0.9
x
=
0.8
:
0.3
(5)
−2.1
:
−1.2
=
−10.5
:
x
−
0.2
(6)
−1.4
:
−1.4
x
=
1
:
1.3
(7)
1.6
:
−0.8
x
=
−1.5
:
−2.4
(8)
−7
:
−0.7
=
x
−
1
:
0.7
(9)
0.5
:
1.1
=
−1.1
x
:
2.42
(10)
−0.16
:
1.6
x
=
−1.7
:
−17
(11)
−0.8
:
x
−
2
=
1.3
:
6.5
(12)
−1.4
x
:
2.1
=
−0.4
:
0.75
(13)
0.2
x
:
2.2
=
−1.1
:
1.1
(14)
−1.8
:
2.16
=
−1.5
:
x
−
1.1
(15)
1
:
−1
=
x
−
1.2
:
−0.9
(16)
x
−
1.3
:
−1.1
=
3
:
1.5
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
1.7
:
8.5
=
0.4
:
x
−
0.1
1.7
×
(
x
−
0.1
)
=
8.5
×
0.4
x
−
0.1
=
2
x
=
2.1
(2)
−0.24
:
0.3
x
=
−0.8
:
−4
−0.8
×
0.3
x
=
−0.24
×
(
−4
)
x
=
−4
(3)
−1.5
:
0.4
=
x
−
0.1
:
0.8
0.4
×
(
x
−
0.1
)
=
−1.5
×
0.8
x
−
0.1
=
−3
x
=
−2.9
(4)
3.6
:
0.9
x
=
0.8
:
0.3
0.8
×
0.9
x
=
3.6
×
0.3
x
=
1.5
(5)
−2.1
:
−1.2
=
−10.5
:
x
−
0.2
−2.1
×
(
x
−
0.2
)
=
−1.2
×
(
−10.5
)
x
−
0.2
=
−6
x
=
−5.8
(6)
−1.4
:
−1.4
x
=
1
:
1.3
−1.4
x
=
−1.4
×
1.3
x
=
1.3
(7)
1.6
:
−0.8
x
=
−1.5
:
−2.4
−1.5
×
(
−0.8
)
x
=
1.6
×
(
−2.4
)
x
=
−3.2
(8)
−7
:
−0.7
=
x
−
1
:
0.7
−0.7
×
(
x
−
1
)
=
−7
×
0.7
x
−
1
=
7
x
=
8
(9)
0.5
:
1.1
=
−1.1
x
:
2.42
1.1
×
(
−1.1
)
x
=
0.5
×
2.42
x
=
−1
(10)
−0.16
:
1.6
x
=
−1.7
:
−17
−1.7
×
1.6
x
=
−0.16
×
(
−17
)
x
=
−1
(11)
−0.8
:
x
−
2
=
1.3
:
6.5
1.3
×
(
x
−
2
)
=
−0.8
×
6.5
x
−
2
=
−4
x
=
−2
(12)
−1.4
x
:
2.1
=
−0.4
:
0.75
0.75
×
(
−1.4
)
x
=
2.1
×
(
−0.4
)
x
=
0.8
(13)
0.2
x
:
2.2
=
−1.1
:
1.1
1.1
×
0.2
x
=
2.2
×
(
−1.1
)
x
=
−11
(14)
−1.8
:
2.16
=
−1.5
:
x
−
1.1
−1.8
×
(
x
−
1.1
)
=
2.16
×
(
−1.5
)
x
−
1.1
=
1.8
x
=
2.9
(15)
1
:
−1
=
x
−
1.2
:
−0.9
−
(
x
−
1.2
)
=
−0.9
x
−
1.2
=
0.9
x
=
2.1
(16)
x
−
1.3
:
−1.1
=
3
:
1.5
1.5
×
(
x
−
1.3
)
=
−1.1
×
3
x
−
1.3
=
−2.2
x
=
−0.9