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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)
−3
:
x
−
5
=
5
:
−10
(2)
−16
:
−8
=
−4
:
x
−
5
(3)
−12
:
x
+
2
=
4
:
−1
(4)
10
:
−2
=
−20
:
2
x
(5)
−6
:
−2
x
=
−2
:
−10
(6)
−8
:
2
x
=
−20
:
−25
(7)
5
:
x
+
4
=
15
:
9
(8)
−5
:
5
=
−8
:
−2
x
(9)
−2
:
−10
=
4
:
x
−
1
(10)
−1
:
2
=
−4
:
−2
x
(11)
−30
:
2
x
=
5
:
−3
(12)
10
:
15
=
2
:
x
+
4
(13)
−4
x
:
−100
=
−3
:
−5
(14)
−3
:
−4
=
−60
:
4
x
(15)
x
+
2
:
3
=
20
:
12
(16)
−30
:
3
x
=
−5
:
−3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−3
:
x
−
5
=
5
:
−10
5
×
(
x
−
5
)
=
−3
×
(
−10
)
x
−
5
=
6
x
=
11
(2)
−16
:
−8
=
−4
:
x
−
5
−16
×
(
x
−
5
)
=
−8
×
(
−4
)
x
−
5
=
−2
x
=
3
(3)
−12
:
x
+
2
=
4
:
−1
4
×
(
x
+
2
)
=
−12
×
(
−1
)
x
+
2
=
3
x
=
1
(4)
10
:
−2
=
−20
:
2
x
10
×
2
x
=
−2
×
(
−20
)
x
=
2
(5)
−6
:
−2
x
=
−2
:
−10
−2
×
(
−2
)
x
=
−6
×
(
−10
)
x
=
15
(6)
−8
:
2
x
=
−20
:
−25
−20
×
2
x
=
−8
×
(
−25
)
x
=
−5
(7)
5
:
x
+
4
=
15
:
9
15
×
(
x
+
4
)
=
5
×
9
x
+
4
=
3
x
=
−1
(8)
−5
:
5
=
−8
:
−2
x
−5
×
(
−2
)
x
=
5
×
(
−8
)
x
=
−4
(9)
−2
:
−10
=
4
:
x
−
1
−2
×
(
x
−
1
)
=
−10
×
4
x
−
1
=
20
x
=
21
(10)
−1
:
2
=
−4
:
−2
x
−
(
−2
)
x
=
2
×
(
−4
)
x
=
−4
(11)
−30
:
2
x
=
5
:
−3
5
×
2
x
=
−30
×
(
−3
)
x
=
9
(12)
10
:
15
=
2
:
x
+
4
10
×
(
x
+
4
)
=
15
×
2
x
+
4
=
3
x
=
−1
(13)
−4
x
:
−100
=
−3
:
−5
−5
×
(
−4
)
x
=
−100
×
(
−3
)
x
=
15
(14)
−3
:
−4
=
−60
:
4
x
−3
×
4
x
=
−4
×
(
−60
)
x
=
−20
(15)
x
+
2
:
3
=
20
:
12
12
×
(
x
+
2
)
=
3
×
20
x
+
2
=
5
x
=
3
(16)
−30
:
3
x
=
−5
:
−3
−5
×
3
x
=
−30
×
(
−3
)
x
=
−6