Question

なつ

求第一題的解 左邊為題目 右邊是我的算是 想請問是哪個地方算錯了🙏🏻

(1)若P-2:P=5:12,求n=?
(2)若le=6P10,,求n=?

0
(1)
5
n!
(h-3)!
11
12
(n-2)!
((n-2)-3)!
7 5
A
18(n-1)
=12
(11-1)(-2)
-(-2)(n-3) (n-4)
7 5 =
(n-1)
=
(h-3)(n-4)
n-1
§ 5 =
n²-10+12
5n²-35n+60=n-1
= 5n ² - 36n+61=0 7