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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
[0G1-00]
(1)
−2
x
:
10
=
−12
:
3
(2)
9
:
−3
=
3
:
x
−
1
(3)
16
:
x
−
1
=
−4
:
5
(4)
x
−
4
:
1
=
−12
:
4
(5)
x
+
4
:
6
=
−1
:
3
(6)
−20
:
−25
=
x
−
2
:
5
(7)
−3
:
−1
=
3
:
x
−
5
(8)
x
−
2
:
4
=
−10
:
−5
(9)
x
+
2
:
2
=
−10
:
−5
(10)
−2
:
−8
=
−20
:
−5
x
(11)
−2
:
−1
=
x
+
4
:
5
(12)
10
:
−2
=
25
:
x
+
2
(13)
−4
:
12
=
−4
:
−4
x
(14)
4
:
5
=
−2
x
:
−50
(15)
10
:
−20
=
−2
:
x
−
2
(16)
10
:
5
=
−5
x
:
10
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−2
x
:
10
=
−12
:
3
3
×
(
−2
)
x
=
10
×
(
−12
)
x
=
20
(2)
9
:
−3
=
3
:
x
−
1
9
×
(
x
−
1
)
=
−3
×
3
x
−
1
=
−1
x
=
0
(3)
16
:
x
−
1
=
−4
:
5
−4
×
(
x
−
1
)
=
16
×
5
x
−
1
=
−20
x
=
−19
(4)
x
−
4
:
1
=
−12
:
4
4
×
(
x
−
4
)
=
−12
x
−
4
=
−3
x
=
1
(5)
x
+
4
:
6
=
−1
:
3
3
×
(
x
+
4
)
=
6
×
(
−1
)
x
+
4
=
−2
x
=
−6
(6)
−20
:
−25
=
x
−
2
:
5
−25
×
(
x
−
2
)
=
−20
×
5
x
−
2
=
4
x
=
6
(7)
−3
:
−1
=
3
:
x
−
5
−3
×
(
x
−
5
)
=
−
3
x
−
5
=
1
x
=
6
(8)
x
−
2
:
4
=
−10
:
−5
−5
×
(
x
−
2
)
=
4
×
(
−10
)
x
−
2
=
8
x
=
10
(9)
x
+
2
:
2
=
−10
:
−5
−5
×
(
x
+
2
)
=
2
×
(
−10
)
x
+
2
=
4
x
=
2
(10)
−2
:
−8
=
−20
:
−5
x
−2
×
(
−5
)
x
=
−8
×
(
−20
)
x
=
16
(11)
−2
:
−1
=
x
+
4
:
5
−
(
x
+
4
)
=
−2
×
5
x
+
4
=
10
x
=
6
(12)
10
:
−2
=
25
:
x
+
2
10
×
(
x
+
2
)
=
−2
×
25
x
+
2
=
−5
x
=
−7
(13)
−4
:
12
=
−4
:
−4
x
−4
×
(
−4
)
x
=
12
×
(
−4
)
x
=
−3
(14)
4
:
5
=
−2
x
:
−50
5
×
(
−2
)
x
=
4
×
(
−50
)
x
=
20
(15)
10
:
−20
=
−2
:
x
−
2
10
×
(
x
−
2
)
=
−20
×
(
−2
)
x
−
2
=
4
x
=
6
(16)
10
:
5
=
−5
x
:
10
5
×
(
−5
)
x
=
10
×
10
x
=
−4