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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
+
5
=
2
:
−8
(2)
−5
:
−2
=
2
x
:
−8
(3)
−9
:
−12
=
5
x
:
20
(4)
5
:
−5
=
x
+
2
:
5
(5)
−1
:
1
=
−12
:
4
x
(6)
12
:
−3
=
5
x
:
−20
(7)
4
:
−
x
=
5
:
−10
(8)
4
:
20
=
x
−
2
:
5
(9)
−10
:
−5
=
8
:
2
x
(10)
−3
:
5
=
9
:
x
+
3
(11)
−3
x
:
−3
=
4
:
−4
(12)
−15
:
x
−
4
=
3
:
5
(13)
2
:
−8
=
−3
x
:
−60
(14)
x
+
5
:
20
=
−3
:
−5
(15)
3
:
−3
=
−2
:
x
+
5
(16)
−4
:
2
=
x
−
2
:
1
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−1
:
x
+
5
=
2
:
−8
2
×
(
x
+
5
)
=
−
(
−8
)
x
+
5
=
4
x
=
−1
(2)
−5
:
−2
=
2
x
:
−8
−2
×
2
x
=
−5
×
(
−8
)
x
=
−10
(3)
−9
:
−12
=
5
x
:
20
−12
×
5
x
=
−9
×
20
x
=
3
(4)
5
:
−5
=
x
+
2
:
5
−5
×
(
x
+
2
)
=
5
×
5
x
+
2
=
−5
x
=
−7
(5)
−1
:
1
=
−12
:
4
x
−
4
x
=
−12
x
=
3
(6)
12
:
−3
=
5
x
:
−20
−3
×
5
x
=
12
×
(
−20
)
x
=
16
(7)
4
:
−
x
=
5
:
−10
5
×
(
−1
)
x
=
4
×
(
−10
)
x
=
8
(8)
4
:
20
=
x
−
2
:
5
20
×
(
x
−
2
)
=
4
×
5
x
−
2
=
1
x
=
3
(9)
−10
:
−5
=
8
:
2
x
−10
×
2
x
=
−5
×
8
x
=
2
(10)
−3
:
5
=
9
:
x
+
3
−3
×
(
x
+
3
)
=
5
×
9
x
+
3
=
−15
x
=
−18
(11)
−3
x
:
−3
=
4
:
−4
−4
×
(
−3
)
x
=
−3
×
4
x
=
−1
(12)
−15
:
x
−
4
=
3
:
5
3
×
(
x
−
4
)
=
−15
×
5
x
−
4
=
−25
x
=
−21
(13)
2
:
−8
=
−3
x
:
−60
−8
×
(
−3
)
x
=
2
×
(
−60
)
x
=
−5
(14)
x
+
5
:
20
=
−3
:
−5
−5
×
(
x
+
5
)
=
20
×
(
−3
)
x
+
5
=
12
x
=
7
(15)
3
:
−3
=
−2
:
x
+
5
3
×
(
x
+
5
)
=
−3
×
(
−2
)
x
+
5
=
2
x
=
−3
(16)
−4
:
2
=
x
−
2
:
1
2
×
(
x
−
2
)
=
−4
x
−
2
=
−2
x
=
0