Question

as

求解5、7、8🙏🙏🙏

z. totiž, 7 , , , , , ... THE NE 1 1 2 3 4
3. a = - Az=7, Anty = Žan (Han), n2) ► 0110-21og=
14
4、
16 30 25
12 3 2
12 3
12
2%
822
7x7
n
5x5
24
72
6
48
6
21576
42.282
55 36
D22
10x10 3 3 8 th 25 100 11 2 3 6 385
91 49 14 064
2xz
3x3
4x4
6x6
24-15 ricarl)-57600
+2+3+...+ 1 = 14400 na
(n(n+1)
2) = 14400 (nth = 14400 nith - 57600
2016
a, =. a 11+0/2= 75 512=27
zoda 60 nézaitintd] 6/1271143733
aiz6 zai+21d=75
= 45x6=270 162172
An+
老
,
rso
< >
an=lt (n-1)x3
3n
h
"ans 3n-2
S2 3
S2:-4+12-4
-4 .
d=3
213
zai+d=15
5. ,72'+3't....
bl <an> #, ai + Az = 15,
7.
8.
to 31) san> to Sn=- non-4
Lans 26 ai 2 a2=512. Sn682 =
cart
Si=1 to
95
PEN

Answer 1

小寶

5.14400開根號是120

小寶

7.假設解方程式

小寶

8.用Sn-Sn-1