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