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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)
x
−
3
:
−3
=
−3
:
3
(2)
−4
:
x
+
5
=
−16
:
−4
(3)
−9
:
−3
=
4
x
:
−8
(4)
−3
:
3
x
=
−5
:
5
(5)
−5
:
25
=
1
:
x
+
4
(6)
10
:
−8
=
−15
:
3
x
(7)
5
:
−5
=
x
+
4
:
20
(8)
6
:
−4
=
−3
:
x
−
1
(9)
2
:
x
−
1
=
−5
:
−20
(10)
x
−
3
:
1
=
−5
:
−1
(11)
−5
:
2
=
−15
:
x
+
4
(12)
3
x
:
3
=
12
:
−4
(13)
x
+
5
:
10
=
1
:
2
(14)
25
:
−10
=
−5
:
x
+
2
(15)
4
:
16
=
4
x
:
48
(16)
−10
:
x
−
3
=
2
:
−1
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
x
−
3
:
−3
=
−3
:
3
3
×
(
x
−
3
)
=
−3
×
(
−3
)
x
−
3
=
3
x
=
6
(2)
−4
:
x
+
5
=
−16
:
−4
−16
×
(
x
+
5
)
=
−4
×
(
−4
)
x
+
5
=
−1
x
=
−6
(3)
−9
:
−3
=
4
x
:
−8
−3
×
4
x
=
−9
×
(
−8
)
x
=
−6
(4)
−3
:
3
x
=
−5
:
5
−5
×
3
x
=
−3
×
5
x
=
1
(5)
−5
:
25
=
1
:
x
+
4
−5
×
(
x
+
4
)
=
25
x
+
4
=
−5
x
=
−9
(6)
10
:
−8
=
−15
:
3
x
10
×
3
x
=
−8
×
(
−15
)
x
=
4
(7)
5
:
−5
=
x
+
4
:
20
−5
×
(
x
+
4
)
=
5
×
20
x
+
4
=
−20
x
=
−24
(8)
6
:
−4
=
−3
:
x
−
1
6
×
(
x
−
1
)
=
−4
×
(
−3
)
x
−
1
=
2
x
=
3
(9)
2
:
x
−
1
=
−5
:
−20
−5
×
(
x
−
1
)
=
2
×
(
−20
)
x
−
1
=
8
x
=
9
(10)
x
−
3
:
1
=
−5
:
−1
−
(
x
−
3
)
=
−5
x
−
3
=
5
x
=
8
(11)
−5
:
2
=
−15
:
x
+
4
−5
×
(
x
+
4
)
=
2
×
(
−15
)
x
+
4
=
6
x
=
2
(12)
3
x
:
3
=
12
:
−4
−4
×
3
x
=
3
×
12
x
=
−3
(13)
x
+
5
:
10
=
1
:
2
2
×
(
x
+
5
)
=
10
x
+
5
=
5
x
=
0
(14)
25
:
−10
=
−5
:
x
+
2
25
×
(
x
+
2
)
=
−10
×
(
−5
)
x
+
2
=
2
x
=
0
(15)
4
:
16
=
4
x
:
48
16
×
4
x
=
4
×
48
x
=
3
(16)
−10
:
x
−
3
=
2
:
−1
2
×
(
x
−
3
)
=
−10
×
(
−1
)
x
−
3
=
5
x
=
8