Question

PLS AM NEVOIE URGENT! DAU FOLLOW,LIKE,COROANA​

Answer 1

a)

a= √1+√2+√3+...+√63

b= √2+√3+...+√64

_______________ Scadere

=> a-b=(√1+√2+...+√63)-(√2+...+√64)

a-b= √1+√2+...+√63-√2-√3-√4-...-√64

a-b= √1-√64

a-b= 1-8 = -7

a-b=-7=> -b=-a-7 => b=a+7 => a<b

b)

a= √1-√2+√3-√4+...+√83-√84

b= √1+√2+√3+...+√24

a= √1+√3+√5+...+√83-√2-√4-...-√84

√n-1 < √n => √n-1 - √n < 0

=> a < 0

b > 0 => a<b