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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)
4
:
x
−
1
=
−5
:
25
(2)
−16
:
−4
x
=
−20
:
5
(3)
−2
:
−1
=
−5
x
:
−5
(4)
−2
x
:
4
=
−15
:
10
(5)
−10
:
x
+
5
=
−6
:
3
(6)
−4
:
16
=
3
:
x
+
4
(7)
4
:
−2
x
=
2
:
3
(8)
2
:
−5
=
x
+
3
:
5
(9)
−5
:
2
=
80
:
−4
x
(10)
x
+
3
:
−4
=
8
:
−8
(11)
6
:
x
+
3
=
−3
:
−1
(12)
−1
:
−3
=
−4
:
x
+
3
(13)
x
−
4
:
25
=
2
:
10
(14)
12
:
4
=
x
+
4
:
3
(15)
−3
x
:
−6
=
2
:
4
(16)
−16
:
−4
x
=
2
:
1
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
4
:
x
−
1
=
−5
:
25
−5
×
(
x
−
1
)
=
4
×
25
x
−
1
=
−20
x
=
−19
(2)
−16
:
−4
x
=
−20
:
5
−20
×
(
−4
)
x
=
−16
×
5
x
=
−1
(3)
−2
:
−1
=
−5
x
:
−5
−
(
−5
)
x
=
−2
×
(
−5
)
x
=
2
(4)
−2
x
:
4
=
−15
:
10
10
×
(
−2
)
x
=
4
×
(
−15
)
x
=
3
(5)
−10
:
x
+
5
=
−6
:
3
−6
×
(
x
+
5
)
=
−10
×
3
x
+
5
=
5
x
=
0
(6)
−4
:
16
=
3
:
x
+
4
−4
×
(
x
+
4
)
=
16
×
3
x
+
4
=
−12
x
=
−16
(7)
4
:
−2
x
=
2
:
3
2
×
(
−2
)
x
=
4
×
3
x
=
−3
(8)
2
:
−5
=
x
+
3
:
5
−5
×
(
x
+
3
)
=
2
×
5
x
+
3
=
−2
x
=
−5
(9)
−5
:
2
=
80
:
−4
x
−5
×
(
−4
)
x
=
2
×
80
x
=
8
(10)
x
+
3
:
−4
=
8
:
−8
−8
×
(
x
+
3
)
=
−4
×
8
x
+
3
=
4
x
=
1
(11)
6
:
x
+
3
=
−3
:
−1
−3
×
(
x
+
3
)
=
6
×
(
−1
)
x
+
3
=
2
x
=
−1
(12)
−1
:
−3
=
−4
:
x
+
3
−
(
x
+
3
)
=
−3
×
(
−4
)
x
+
3
=
−12
x
=
−15
(13)
x
−
4
:
25
=
2
:
10
10
×
(
x
−
4
)
=
25
×
2
x
−
4
=
5
x
=
9
(14)
12
:
4
=
x
+
4
:
3
4
×
(
x
+
4
)
=
12
×
3
x
+
4
=
9
x
=
5
(15)
−3
x
:
−6
=
2
:
4
4
×
(
−3
)
x
=
−6
×
2
x
=
1
(16)
−16
:
−4
x
=
2
:
1
2
×
(
−4
)
x
=
−16
x
=
2