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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)
−1
:
x
−
2
=
3
:
−9
(2)
−4
x
:
−4
=
−15
:
3
(3)
4
x
:
−4
=
−6
:
2
(4)
x
+
2
:
1
=
−15
:
−3
(5)
15
:
20
=
x
+
5
:
4
(6)
−4
:
−12
=
−12
:
4
x
(7)
−12
:
3
=
x
+
4
:
−4
(8)
−5
:
−20
=
−3
x
:
48
(9)
−15
:
−3
x
=
−2
:
8
(10)
2
x
:
−4
=
2
:
−4
(11)
−3
:
−1
=
−6
:
x
+
4
(12)
−8
:
−6
=
−2
x
:
6
(13)
4
:
16
=
4
x
:
−64
(14)
−3
x
:
3
=
−20
:
−4
(15)
2
:
−2
=
1
:
x
−
2
(16)
−4
x
:
−4
=
4
:
−1
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−1
:
x
−
2
=
3
:
−9
3
×
(
x
−
2
)
=
−
(
−9
)
x
−
2
=
3
x
=
5
(2)
−4
x
:
−4
=
−15
:
3
3
×
(
−4
)
x
=
−4
×
(
−15
)
x
=
−5
(3)
4
x
:
−4
=
−6
:
2
2
×
4
x
=
−4
×
(
−6
)
x
=
3
(4)
x
+
2
:
1
=
−15
:
−3
−3
×
(
x
+
2
)
=
−15
x
+
2
=
5
x
=
3
(5)
15
:
20
=
x
+
5
:
4
20
×
(
x
+
5
)
=
15
×
4
x
+
5
=
3
x
=
−2
(6)
−4
:
−12
=
−12
:
4
x
−4
×
4
x
=
−12
×
(
−12
)
x
=
−9
(7)
−12
:
3
=
x
+
4
:
−4
3
×
(
x
+
4
)
=
−12
×
(
−4
)
x
+
4
=
16
x
=
12
(8)
−5
:
−20
=
−3
x
:
48
−20
×
(
−3
)
x
=
−5
×
48
x
=
−4
(9)
−15
:
−3
x
=
−2
:
8
−2
×
(
−3
)
x
=
−15
×
8
x
=
−20
(10)
2
x
:
−4
=
2
:
−4
−4
×
2
x
=
−4
×
2
x
=
1
(11)
−3
:
−1
=
−6
:
x
+
4
−3
×
(
x
+
4
)
=
−
(
−6
)
x
+
4
=
−2
x
=
−6
(12)
−8
:
−6
=
−2
x
:
6
−6
×
(
−2
)
x
=
−8
×
6
x
=
−4
(13)
4
:
16
=
4
x
:
−64
16
×
4
x
=
4
×
(
−64
)
x
=
−4
(14)
−3
x
:
3
=
−20
:
−4
−4
×
(
−3
)
x
=
3
×
(
−20
)
x
=
−5
(15)
2
:
−2
=
1
:
x
−
2
2
×
(
x
−
2
)
=
−2
x
−
2
=
−1
x
=
1
(16)
−4
x
:
−4
=
4
:
−1
−
(
−4
)
x
=
−4
×
4
x
=
−4