{ 1,2}
1-i
1/5
Root number 3
1
2 root number 2
y2-x2= 1。 8.& gt2.9.8. 10. 10
1 1.- root number 2/2
12.-2 Root number 2
13.3+2 root number 2
14.3
16.( 1)32(2) 1 & lt； = f(b)& lt； =3/2
17.s= 100Q+200cosQ
SinQ= 1/2
18.( 1)x2/4+y2/3= 1
(2)48/7 & lt； = a b+ CD & lt； =7
19 ( 1)a=2
(2)
20.an=Bn- 1-bn.... 1
1/bn-1/bn-1=1/2an ... 2 from1/bn = (TN+1)/2 = (TN-/kloc-0
2q 2-5q+2 = 0q = bn/bn- 1 When the generation of 1 advances to 2.
Q= 1/2 or q=2 (s).
B 1= 1, so the common ratio of bn is 1 and the equal ratio is 1/2.
The last question is to do or not to do.
Please adopt it.