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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
:
−2
=
x
−
4
:
3
(2)
5
:
−20
=
−4
x
:
−16
(3)
x
−
3
:
−16
=
−4
:
16
(4)
−4
x
:
−80
=
−2
:
10
(5)
−5
:
−10
=
−1
:
x
+
5
(6)
2
:
−8
=
x
−
1
:
−4
(7)
−25
:
5
=
−
x
:
1
(8)
−3
x
:
75
=
−1
:
5
(9)
2
:
x
+
5
=
−2
:
−3
(10)
5
:
−5
x
=
1
:
−5
(11)
x
+
4
:
1
=
4
:
2
(12)
−16
:
12
=
x
−
2
:
3
(13)
12
:
−3
x
=
−20
:
15
(14)
75
:
−3
x
=
10
:
2
(15)
20
:
5
x
=
−10
:
−5
(16)
3
:
4
=
−6
:
x
−
3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
:
−2
=
x
−
4
:
3
−2
×
(
x
−
4
)
=
2
×
3
x
−
4
=
−3
x
=
1
(2)
5
:
−20
=
−4
x
:
−16
−20
×
(
−4
)
x
=
5
×
(
−16
)
x
=
−1
(3)
x
−
3
:
−16
=
−4
:
16
16
×
(
x
−
3
)
=
−16
×
(
−4
)
x
−
3
=
4
x
=
7
(4)
−4
x
:
−80
=
−2
:
10
10
×
(
−4
)
x
=
−80
×
(
−2
)
x
=
−4
(5)
−5
:
−10
=
−1
:
x
+
5
−5
×
(
x
+
5
)
=
−10
×
(
−1
)
x
+
5
=
−2
x
=
−7
(6)
2
:
−8
=
x
−
1
:
−4
−8
×
(
x
−
1
)
=
2
×
(
−4
)
x
−
1
=
1
x
=
2
(7)
−25
:
5
=
−
x
:
1
5
×
(
−1
)
x
=
−25
x
=
5
(8)
−3
x
:
75
=
−1
:
5
5
×
(
−3
)
x
=
75
×
(
−1
)
x
=
5
(9)
2
:
x
+
5
=
−2
:
−3
−2
×
(
x
+
5
)
=
2
×
(
−3
)
x
+
5
=
3
x
=
−2
(10)
5
:
−5
x
=
1
:
−5
−5
x
=
5
×
(
−5
)
x
=
5
(11)
x
+
4
:
1
=
4
:
2
2
×
(
x
+
4
)
=
4
x
+
4
=
2
x
=
−2
(12)
−16
:
12
=
x
−
2
:
3
12
×
(
x
−
2
)
=
−16
×
3
x
−
2
=
−4
x
=
−2
(13)
12
:
−3
x
=
−20
:
15
−20
×
(
−3
)
x
=
12
×
15
x
=
3
(14)
75
:
−3
x
=
10
:
2
10
×
(
−3
)
x
=
75
×
2
x
=
−5
(15)
20
:
5
x
=
−10
:
−5
−10
×
5
x
=
20
×
(
−5
)
x
=
2
(16)
3
:
4
=
−6
:
x
−
3
3
×
(
x
−
3
)
=
4
×
(
−6
)
x
−
3
=
−8
x
=
−5