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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)
1
:
x
+
4
=
−1
:
−4
(2)
16
:
−4
=
16
:
−
x
(3)
12
:
x
−
5
=
−4
:
−1
(4)
−15
:
3
=
x
+
5
:
2
(5)
6
:
−2
=
36
:
−4
x
(6)
6
:
−3
=
4
:
2
x
(7)
8
:
x
−
2
=
4
:
−2
(8)
−25
:
−5
=
−75
:
−5
x
(9)
3
x
:
−3
=
−6
:
−2
(10)
−3
:
5
=
4
x
:
−100
(11)
x
+
4
:
−1
=
−10
:
2
(12)
4
:
−4
=
x
+
5
:
12
(13)
x
+
4
:
1
=
12
:
−4
(14)
x
−
2
:
10
=
5
:
2
(15)
−20
:
x
−
4
=
10
:
−2
(16)
−25
:
x
+
5
=
20
:
−4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
1
:
x
+
4
=
−1
:
−4
−
(
x
+
4
)
=
−4
x
+
4
=
4
x
=
0
(2)
16
:
−4
=
16
:
−
x
16
×
(
−1
)
x
=
−4
×
16
x
=
4
(3)
12
:
x
−
5
=
−4
:
−1
−4
×
(
x
−
5
)
=
12
×
(
−1
)
x
−
5
=
3
x
=
8
(4)
−15
:
3
=
x
+
5
:
2
3
×
(
x
+
5
)
=
−15
×
2
x
+
5
=
−10
x
=
−15
(5)
6
:
−2
=
36
:
−4
x
6
×
(
−4
)
x
=
−2
×
36
x
=
3
(6)
6
:
−3
=
4
:
2
x
6
×
2
x
=
−3
×
4
x
=
−1
(7)
8
:
x
−
2
=
4
:
−2
4
×
(
x
−
2
)
=
8
×
(
−2
)
x
−
2
=
−4
x
=
−2
(8)
−25
:
−5
=
−75
:
−5
x
−25
×
(
−5
)
x
=
−5
×
(
−75
)
x
=
3
(9)
3
x
:
−3
=
−6
:
−2
−2
×
3
x
=
−3
×
(
−6
)
x
=
−3
(10)
−3
:
5
=
4
x
:
−100
5
×
4
x
=
−3
×
(
−100
)
x
=
15
(11)
x
+
4
:
−1
=
−10
:
2
2
×
(
x
+
4
)
=
−
(
−10
)
x
+
4
=
5
x
=
1
(12)
4
:
−4
=
x
+
5
:
12
−4
×
(
x
+
5
)
=
4
×
12
x
+
5
=
−12
x
=
−17
(13)
x
+
4
:
1
=
12
:
−4
−4
×
(
x
+
4
)
=
12
x
+
4
=
−3
x
=
−7
(14)
x
−
2
:
10
=
5
:
2
2
×
(
x
−
2
)
=
10
×
5
x
−
2
=
25
x
=
27
(15)
−20
:
x
−
4
=
10
:
−2
10
×
(
x
−
4
)
=
−20
×
(
−2
)
x
−
4
=
4
x
=
8
(16)
−25
:
x
+
5
=
20
:
−4
20
×
(
x
+
5
)
=
−25
×
(
−4
)
x
+
5
=
5
x
=
0