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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
+
3
:
10
=
−1
:
2
(2)
−6
:
2
=
3
x
:
15
(3)
x
+
2
:
−1
=
16
:
−4
(4)
−5
:
−4
=
−4
x
:
32
(5)
−1
:
2
=
4
x
:
−8
(6)
x
−
1
:
2
=
4
:
−1
(7)
−1
:
−3
=
1
:
x
+
5
(8)
5
:
−5
=
−5
:
x
+
2
(9)
3
:
x
−
5
=
12
:
−4
(10)
−5
x
:
−100
=
1
:
−5
(11)
−2
:
−1
=
10
:
5
x
(12)
2
:
−2
=
−1
:
−
x
(13)
3
:
−3
x
=
4
:
16
(14)
−4
:
1
=
2
x
:
−8
(15)
−20
:
5
=
12
:
x
−
3
(16)
4
:
x
+
4
=
−16
:
8
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
x
+
3
:
10
=
−1
:
2
2
×
(
x
+
3
)
=
10
×
(
−1
)
x
+
3
=
−5
x
=
−8
(2)
−6
:
2
=
3
x
:
15
2
×
3
x
=
−6
×
15
x
=
−15
(3)
x
+
2
:
−1
=
16
:
−4
−4
×
(
x
+
2
)
=
−
16
x
+
2
=
4
x
=
2
(4)
−5
:
−4
=
−4
x
:
32
−4
×
(
−4
)
x
=
−5
×
32
x
=
−10
(5)
−1
:
2
=
4
x
:
−8
2
×
4
x
=
−
(
−8
)
x
=
1
(6)
x
−
1
:
2
=
4
:
−1
−
(
x
−
1
)
=
2
×
4
x
−
1
=
−8
x
=
−7
(7)
−1
:
−3
=
1
:
x
+
5
−
(
x
+
5
)
=
−3
x
+
5
=
3
x
=
−2
(8)
5
:
−5
=
−5
:
x
+
2
5
×
(
x
+
2
)
=
−5
×
(
−5
)
x
+
2
=
5
x
=
3
(9)
3
:
x
−
5
=
12
:
−4
12
×
(
x
−
5
)
=
3
×
(
−4
)
x
−
5
=
−1
x
=
4
(10)
−5
x
:
−100
=
1
:
−5
−5
×
(
−5
)
x
=
−100
x
=
−4
(11)
−2
:
−1
=
10
:
5
x
−2
×
5
x
=
−
10
x
=
1
(12)
2
:
−2
=
−1
:
−
x
2
×
(
−1
)
x
=
−2
×
(
−1
)
x
=
−1
(13)
3
:
−3
x
=
4
:
16
4
×
(
−3
)
x
=
3
×
16
x
=
−4
(14)
−4
:
1
=
2
x
:
−8
2
x
=
−4
×
(
−8
)
x
=
16
(15)
−20
:
5
=
12
:
x
−
3
−20
×
(
x
−
3
)
=
5
×
12
x
−
3
=
−3
x
=
0
(16)
4
:
x
+
4
=
−16
:
8
−16
×
(
x
+
4
)
=
4
×
8
x
+
4
=
−2
x
=
−6