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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
[0G1-00]
(1)
−3
x
:
12
=
1
:
−1
(2)
8
:
x
+
2
=
4
:
−2
(3)
x
+
4
:
1
=
2
:
−1
(4)
x
−
3
:
15
=
−5
:
−25
(5)
−10
:
x
−
2
=
−2
:
−5
(6)
27
:
3
x
=
3
:
−1
(7)
x
−
3
:
5
=
−16
:
−20
(8)
x
−
4
:
1
=
10
:
−2
(9)
−5
x
:
10
=
−10
:
4
(10)
−2
:
6
=
−3
:
x
−
1
(11)
−6
:
4
=
15
:
5
x
(12)
x
−
2
:
−5
=
−5
:
−1
(13)
−15
:
−3
x
=
10
:
−2
(14)
−4
:
2
=
−20
:
−5
x
(15)
5
:
−2
=
−20
:
x
−
5
(16)
2
:
−6
=
x
+
2
:
−3
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−3
x
:
12
=
1
:
−1
−
(
−3
)
x
=
12
x
=
4
(2)
8
:
x
+
2
=
4
:
−2
4
×
(
x
+
2
)
=
8
×
(
−2
)
x
+
2
=
−4
x
=
−6
(3)
x
+
4
:
1
=
2
:
−1
−
(
x
+
4
)
=
2
x
+
4
=
−2
x
=
−6
(4)
x
−
3
:
15
=
−5
:
−25
−25
×
(
x
−
3
)
=
15
×
(
−5
)
x
−
3
=
3
x
=
6
(5)
−10
:
x
−
2
=
−2
:
−5
−2
×
(
x
−
2
)
=
−10
×
(
−5
)
x
−
2
=
−25
x
=
−23
(6)
27
:
3
x
=
3
:
−1
3
×
3
x
=
27
×
(
−1
)
x
=
−3
(7)
x
−
3
:
5
=
−16
:
−20
−20
×
(
x
−
3
)
=
5
×
(
−16
)
x
−
3
=
4
x
=
7
(8)
x
−
4
:
1
=
10
:
−2
−2
×
(
x
−
4
)
=
10
x
−
4
=
−5
x
=
−1
(9)
−5
x
:
10
=
−10
:
4
4
×
(
−5
)
x
=
10
×
(
−10
)
x
=
5
(10)
−2
:
6
=
−3
:
x
−
1
−2
×
(
x
−
1
)
=
6
×
(
−3
)
x
−
1
=
9
x
=
10
(11)
−6
:
4
=
15
:
5
x
−6
×
5
x
=
4
×
15
x
=
−2
(12)
x
−
2
:
−5
=
−5
:
−1
−
(
x
−
2
)
=
−5
×
(
−5
)
x
−
2
=
−25
x
=
−23
(13)
−15
:
−3
x
=
10
:
−2
10
×
(
−3
)
x
=
−15
×
(
−2
)
x
=
−1
(14)
−4
:
2
=
−20
:
−5
x
−4
×
(
−5
)
x
=
2
×
(
−20
)
x
=
−2
(15)
5
:
−2
=
−20
:
x
−
5
5
×
(
x
−
5
)
=
−2
×
(
−20
)
x
−
5
=
8
x
=
13
(16)
2
:
−6
=
x
+
2
:
−3
−6
×
(
x
+
2
)
=
2
×
(
−3
)
x
+
2
=
1
x
=
−1