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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
:
−4
=
−2
x
:
−2
(2)
−12
:
3
=
x
+
5
:
5
(3)
−2
:
5
=
2
:
x
+
4
(4)
x
−
4
:
16
=
1
:
4
(5)
−6
:
−2
x
=
5
:
−5
(6)
x
+
2
:
−4
=
1
:
2
(7)
x
−
3
:
−2
=
15
:
6
(8)
−15
:
−5
x
=
−3
:
3
(9)
12
:
x
+
4
=
15
:
5
(10)
x
−
5
:
−1
=
−15
:
5
(11)
−2
:
−4
=
3
:
3
x
(12)
x
+
3
:
−5
=
−2
:
5
(13)
−4
:
−2
=
6
:
3
x
(14)
5
:
−1
=
−75
:
−5
x
(15)
−15
:
−5
x
=
−1
:
−4
(16)
−5
:
−2
=
5
:
x
+
5
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
4
:
−4
=
−2
x
:
−2
−4
×
(
−2
)
x
=
4
×
(
−2
)
x
=
−1
(2)
−12
:
3
=
x
+
5
:
5
3
×
(
x
+
5
)
=
−12
×
5
x
+
5
=
−20
x
=
−25
(3)
−2
:
5
=
2
:
x
+
4
−2
×
(
x
+
4
)
=
5
×
2
x
+
4
=
−5
x
=
−9
(4)
x
−
4
:
16
=
1
:
4
4
×
(
x
−
4
)
=
16
x
−
4
=
4
x
=
8
(5)
−6
:
−2
x
=
5
:
−5
5
×
(
−2
)
x
=
−6
×
(
−5
)
x
=
−3
(6)
x
+
2
:
−4
=
1
:
2
2
×
(
x
+
2
)
=
−4
x
+
2
=
−2
x
=
−4
(7)
x
−
3
:
−2
=
15
:
6
6
×
(
x
−
3
)
=
−2
×
15
x
−
3
=
−5
x
=
−2
(8)
−15
:
−5
x
=
−3
:
3
−3
×
(
−5
)
x
=
−15
×
3
x
=
−3
(9)
12
:
x
+
4
=
15
:
5
15
×
(
x
+
4
)
=
12
×
5
x
+
4
=
4
x
=
0
(10)
x
−
5
:
−1
=
−15
:
5
5
×
(
x
−
5
)
=
−
(
−15
)
x
−
5
=
3
x
=
8
(11)
−2
:
−4
=
3
:
3
x
−2
×
3
x
=
−4
×
3
x
=
2
(12)
x
+
3
:
−5
=
−2
:
5
5
×
(
x
+
3
)
=
−5
×
(
−2
)
x
+
3
=
2
x
=
−1
(13)
−4
:
−2
=
6
:
3
x
−4
×
3
x
=
−2
×
6
x
=
1
(14)
5
:
−1
=
−75
:
−5
x
5
×
(
−5
)
x
=
−
(
−75
)
x
=
−3
(15)
−15
:
−5
x
=
−1
:
−4
−
(
−5
)
x
=
−15
×
(
−4
)
x
=
12
(16)
−5
:
−2
=
5
:
x
+
5
−5
×
(
x
+
5
)
=
−2
×
5
x
+
5
=
2
x
=
−3