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©2025 数学クラブ http://sugaku.club/
月 日（ ）
● 次の方程式を解きなさい
[0E2-00]
(1)
10
x
−
(
−1
)
=
81
(2)
−5
＋
7
x
=
2
x
(3)
3
＋
(
−5
)
x
=
33
(4)
−4
x
−
28
=
10
x
(5)
−8
−
(
−5
)
x
=
−3
(6)
9
x
−
(
−4
)
=
49
(7)
−5
x
−
(
−9
)
=
−8
x
(8)
6
＋
(
−2
)
x
=
12
(9)
−45
−
(
−5
)
x
=
10
x
(10)
7
x
＋
(
−3
)
=
−31
(11)
7
＋
4
x
=
5
x
(12)
2
x
＋
4
=
−16
(13)
−6
−
9
x
=
−7
x
(14)
2
x
−
110
=
−9
x
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
10
x
−
(
−1
)
=
81
10
x
=
81
−
1
10
x
=
80
x
=
8
(2)
−5
＋
7
x
=
2
x
7
x
−
2
x
=
5
5
x
=
5
x
=
1
(3)
3
＋
(
−5
)
x
=
33
−5
x
=
33
−
3
−5
x
=
30
x
=
−6
(4)
−4
x
−
28
=
10
x
−4
x
−
10
x
=
28
−14
x
=
28
x
=
−2
(5)
−8
−
(
−5
)
x
=
−3
5
x
=
−3
＋
8
5
x
=
5
x
=
1
(6)
9
x
−
(
−4
)
=
49
9
x
=
49
−
4
9
x
=
45
x
=
5
(7)
−5
x
−
(
−9
)
=
−8
x
−5
x
＋
8
x
=
−9
3
x
=
−9
x
=
−3
(8)
6
＋
(
−2
)
x
=
12
−2
x
=
12
−
6
−2
x
=
6
x
=
−3
(9)
−45
−
(
−5
)
x
=
10
x
5
x
−
10
x
=
45
−5
x
=
45
x
=
−9
(10)
7
x
＋
(
−3
)
=
−31
7
x
=
−31
＋
3
7
x
=
−28
x
=
−4
(11)
7
＋
4
x
=
5
x
4
x
−
5
x
=
−
7
−
x
=
−7
x
=
7
(12)
2
x
＋
4
=
−16
2
x
=
−16
−
4
2
x
=
−20
x
=
−10
(13)
−6
−
9
x
=
−7
x
−
9
x
＋
7
x
=
6
−2
x
=
6
x
=
−3
(14)
2
x
−
110
=
−9
x
2
x
＋
9
x
=
110
11
x
=
110
x
=
10