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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)
−12
:
16
=
x
−
2
:
−4
(2)
−
x
:
15
=
4
:
−5
(3)
−4
:
16
=
1
:
x
−
5
(4)
2
:
3
=
−2
:
x
+
4
(5)
−5
:
5
=
−1
:
x
+
5
(6)
−50
:
5
x
=
−5
:
−3
(7)
4
:
−2
=
−24
:
−3
x
(8)
3
x
:
−3
=
9
:
−3
(9)
x
+
3
:
4
=
10
:
−2
(10)
−2
:
−4
=
24
:
−4
x
(11)
x
+
4
:
5
=
−1
:
−5
(12)
3
:
−4
=
−3
:
x
−
4
(13)
−5
x
:
−75
=
−2
:
5
(14)
5
:
−2
=
x
+
5
:
10
(15)
6
:
2
x
=
2
:
6
(16)
−15
:
12
=
x
−
4
:
−4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
−12
:
16
=
x
−
2
:
−4
16
×
(
x
−
2
)
=
−12
×
(
−4
)
x
−
2
=
3
x
=
5
(2)
−
x
:
15
=
4
:
−5
−5
×
(
−1
)
x
=
15
×
4
x
=
12
(3)
−4
:
16
=
1
:
x
−
5
−4
×
(
x
−
5
)
=
16
x
−
5
=
−4
x
=
1
(4)
2
:
3
=
−2
:
x
+
4
2
×
(
x
+
4
)
=
3
×
(
−2
)
x
+
4
=
−3
x
=
−7
(5)
−5
:
5
=
−1
:
x
+
5
−5
×
(
x
+
5
)
=
5
×
(
−1
)
x
+
5
=
1
x
=
−4
(6)
−50
:
5
x
=
−5
:
−3
−5
×
5
x
=
−50
×
(
−3
)
x
=
−6
(7)
4
:
−2
=
−24
:
−3
x
4
×
(
−3
)
x
=
−2
×
(
−24
)
x
=
−4
(8)
3
x
:
−3
=
9
:
−3
−3
×
3
x
=
−3
×
9
x
=
3
(9)
x
+
3
:
4
=
10
:
−2
−2
×
(
x
+
3
)
=
4
×
10
x
+
3
=
−20
x
=
−23
(10)
−2
:
−4
=
24
:
−4
x
−2
×
(
−4
)
x
=
−4
×
24
x
=
−12
(11)
x
+
4
:
5
=
−1
:
−5
−5
×
(
x
+
4
)
=
5
×
(
−1
)
x
+
4
=
1
x
=
−3
(12)
3
:
−4
=
−3
:
x
−
4
3
×
(
x
−
4
)
=
−4
×
(
−3
)
x
−
4
=
4
x
=
8
(13)
−5
x
:
−75
=
−2
:
5
5
×
(
−5
)
x
=
−75
×
(
−2
)
x
=
−6
(14)
5
:
−2
=
x
+
5
:
10
−2
×
(
x
+
5
)
=
5
×
10
x
+
5
=
−25
x
=
−30
(15)
6
:
2
x
=
2
:
6
2
×
2
x
=
6
×
6
x
=
9
(16)
−15
:
12
=
x
−
4
:
−4
12
×
(
x
−
4
)
=
−15
×
(
−4
)
x
−
4
=
5
x
=
9