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