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©2024 数学クラブ http://sugaku.club/
月 日（ ）
● 次の方程式を解きなさい
[222-00]
(1)
2
7
x
−
8
x
=
0
(2)
2
x
＋
2
x
=
0
(3)
2
5
x
=
40
x
(4)
2
10
x
＋
70
x
=
0
(5)
2
2
x
＋
4
x
=
0
(6)
2
x
＋
8
x
=
0
(7)
2
3
x
＋
12
x
=
0
(8)
2
3
x
＋
18
x
=
0
(9)
2
8
x
＋
8
x
=
0
(10)
2
8
x
＋
64
x
=
0
©2024 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
7
x
−
8
x
=
0
8
7
x
(
x
−
)
7
=
0
x
8
=
0
，
7
(2)
2
x
＋
2
x
=
0
x
(
x
＋
2
)
=
0
x
=
0
，
−2
(3)
2
5
x
=
40
x
5
x
(
x
−
8
)
=
0
x
=
0
，
8
(4)
2
10
x
＋
70
x
=
0
10
x
(
x
＋
7
)
=
0
x
=
0
，
−7
(5)
2
2
x
＋
4
x
=
0
2
x
(
x
＋
2
)
=
0
x
=
0
，
−2
(6)
2
x
＋
8
x
=
0
x
(
x
＋
8
)
=
0
x
=
0
，
−8
(7)
2
3
x
＋
12
x
=
0
3
x
(
x
＋
4
)
=
0
x
=
0
，
−4
(8)
2
3
x
＋
18
x
=
0
3
x
(
x
＋
6
)
=
0
x
=
0
，
−6
(9)
2
8
x
＋
8
x
=
0
8
x
(
x
＋
1
)
=
0
x
=
0
，
−1
(10)
2
8
x
＋
64
x
=
0
8
x
(
x
＋
8
)
=
0
x
=
0
，
−8