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©2026 数学クラブ http://sugaku.club/
月 日（ ）
● 次の方程式を解きなさい
[212-00]
(1)
2
x
−
19
x
＋
90
=
0
(2)
2
x
＋
7
x
＋
10
=
0
(3)
2
x
＋
2
x
−
63
=
0
(4)
2
x
−
14
x
＋
48
=
0
(5)
2
x
＋
12
x
＋
27
=
0
(6)
2
x
−
8
x
＋
15
=
0
(7)
2
x
−
2
x
−
35
=
0
(8)
2
x
−
17
x
＋
70
=
0
(9)
2
x
＋
12
x
＋
35
=
0
(10)
2
x
＋
3
x
−
40
=
0
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
x
−
19
x
＋
90
=
0
2
361
361
x
−
19
x
＋
−
＋
90
4
4
=
0
19
2
(
x
−
)
2
1
=
4
19
x
−
2
1
=
±
2
x
=
10
，
9
(2)
2
x
＋
7
x
＋
10
=
0
2
49
49
x
＋
7
x
＋
−
＋
10
4
4
=
0
7
2
(
x
＋
)
2
9
=
4
7
x
＋
2
3
=
±
2
x
=
−5
，
−2
(3)
2
x
＋
2
x
−
63
=
0
2
x
＋
2
x
＋
1
−
1
−
63
=
0
2
(
x
＋
1
)
=
64
x
＋
1
=
±
8
x
=
7
，
−9
(4)
2
x
−
14
x
＋
48
=
0
2
x
−
14
x
＋
49
−
49
＋
48
=
0
2
(
x
−
7
)
=
1
x
−
7
=
±
1
x
=
8
，
6
(5)
2
x
＋
12
x
＋
27
=
0
2
x
＋
12
x
＋
36
−
36
＋
27
=
0
2
(
x
＋
6
)
=
9
x
＋
6
=
±
3
x
=
−9
，
−3
(6)
2
x
−
8
x
＋
15
=
0
2
x
−
8
x
＋
16
−
16
＋
15
=
0
2
(
x
−
4
)
=
1
x
−
4
=
±
1
x
=
3
，
5
(7)
2
x
−
2
x
−
35
=
0
2
x
−
2
x
＋
1
−
1
−
35
=
0
2
(
x
−
1
)
=
36
x
−
1
=
±
6
x
=
−5
，
7
(8)
2
x
−
17
x
＋
70
=
0
2
289
289
x
−
17
x
＋
−
＋
70
4
4
=
0
17
2
(
x
−
)
2
9
=
4
17
x
−
2
3
=
±
2
x
=
10
，
7
(9)
2
x
＋
12
x
＋
35
=
0
2
x
＋
12
x
＋
36
−
36
＋
35
=
0
2
(
x
＋
6
)
=
1
x
＋
6
=
±
1
x
=
−5
，
−7
(10)
2
x
＋
3
x
−
40
=
0
2
9
9
x
＋
3
x
＋
−
−
40
4
4
=
0
3
2
(
x
＋
)
2
169
=
4
3
x
＋
2
13
=
±
2
x
=
5
，
−8