1. amaze => amazement

2. celebarate => celebrations

3. occasion => occasionally

4. separation => separate

 Divide that number sequence into 2, odd & even, since the odd always positive & even always negative 
odd number : Un = 2n -1 
even numbers : Un = 2n 

odd sigma(n=100) = n(Un+n0)/2 = n(2n-1+1)/2 = n(2n)/2 = n^2 

even sigma(n=100) = n(Un+n0)/2 = n(2n+2)/2 = n(n+1) = n^2 + n 

sigma(n=100) = n^2 - (n^2 + n) = n^2 - n^2 - n = -n = -100 

1+1+1=3

169 dm2

8+35-2

=43-2

=41

0-1+2-3+4-5+6-7+8-9+10

= 10-9+8-7+6-5+4-3+2-1+0

= (10-9)+(8-7)+(6-5)+(4-3)+(2-1)

= 1 + 1 + 1 + 1 + 1

= 5 

kết quả của mình là a,b=4,5