Question

Yodo

1-1數列級數

5) 75/ air (1+r³) = 10
01×5=5
r = 2
3. 設1, x, y成等比,x,y),3成等差,則x+y之最大值為0
y=x²
3- y = y-y
37x=xy-3
y=(y-3)
y=4y²-124+9
44-134 +9=0
15
L
-44 92 by 3
-yx 1 y 3
339
13
du zb
d
-6

數列級數

Answer 1

shen

x^2=y,2y=x+3
=> 2x^2=x+3 => 2x^2-x-3=0 => x=3/2,-1
(1) x=3/2 y=(3/2)^2=9/4
x+y=15/4

(2) x=-1 y=(-1)^2=1
x+y=0

因此x+y max=15/4