[文字サイズの変更]
▼
▲
©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)
5
:
−15
=
x
+
2
:
9
(2)
−3
x
:
3
=
−6
:
−2
(3)
5
:
−10
=
x
−
2
:
8
(4)
3
:
−12
=
x
−
1
:
−4
(5)
3
:
x
−
2
=
−3
:
2
(6)
x
+
5
:
3
=
−2
:
−1
(7)
6
:
2
x
=
12
:
−16
(8)
−12
:
−3
=
x
−
5
:
3
(9)
4
:
−4
=
12
:
−3
x
(10)
9
:
−3
x
=
6
:
10
(11)
−15
:
20
=
2
x
:
8
(12)
−3
x
:
−9
=
20
:
15
(13)
−2
:
−4
=
−3
:
x
−
4
(14)
−10
:
2
=
x
−
5
:
−1
(15)
−10
:
2
x
=
−10
:
2
(16)
5
:
−4
=
x
−
5
:
4
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
5
:
−15
=
x
+
2
:
9
−15
×
(
x
+
2
)
=
5
×
9
x
+
2
=
−3
x
=
−5
(2)
−3
x
:
3
=
−6
:
−2
−2
×
(
−3
)
x
=
3
×
(
−6
)
x
=
−3
(3)
5
:
−10
=
x
−
2
:
8
−10
×
(
x
−
2
)
=
5
×
8
x
−
2
=
−4
x
=
−2
(4)
3
:
−12
=
x
−
1
:
−4
−12
×
(
x
−
1
)
=
3
×
(
−4
)
x
−
1
=
1
x
=
2
(5)
3
:
x
−
2
=
−3
:
2
−3
×
(
x
−
2
)
=
3
×
2
x
−
2
=
−2
x
=
0
(6)
x
+
5
:
3
=
−2
:
−1
−
(
x
+
5
)
=
3
×
(
−2
)
x
+
5
=
6
x
=
1
(7)
6
:
2
x
=
12
:
−16
12
×
2
x
=
6
×
(
−16
)
x
=
−4
(8)
−12
:
−3
=
x
−
5
:
3
−3
×
(
x
−
5
)
=
−12
×
3
x
−
5
=
12
x
=
17
(9)
4
:
−4
=
12
:
−3
x
4
×
(
−3
)
x
=
−4
×
12
x
=
4
(10)
9
:
−3
x
=
6
:
10
6
×
(
−3
)
x
=
9
×
10
x
=
−5
(11)
−15
:
20
=
2
x
:
8
20
×
2
x
=
−15
×
8
x
=
−3
(12)
−3
x
:
−9
=
20
:
15
15
×
(
−3
)
x
=
−9
×
20
x
=
4
(13)
−2
:
−4
=
−3
:
x
−
4
−2
×
(
x
−
4
)
=
−4
×
(
−3
)
x
−
4
=
−6
x
=
−2
(14)
−10
:
2
=
x
−
5
:
−1
2
×
(
x
−
5
)
=
−10
×
(
−1
)
x
−
5
=
5
x
=
10
(15)
−10
:
2
x
=
−10
:
2
−10
×
2
x
=
−10
×
2
x
=
1
(16)
5
:
−4
=
x
−
5
:
4
−4
×
(
x
−
5
)
=
5
×
4
x
−
5
=
−5
x
=
0