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