Question

va rog!!!!!!!!!!!!!!​

Answer 1

a)1+2+3+...+35=$\frac{35*36}{2}$=18*35=630

$\frac{8}{3}-\frac{210}{630}=\frac{8*210-210}{630} =\frac{7*210}{630}=\frac{7}{3}$

b)1+2+3+...+63=$\frac{63*64}{2}$=63*32=2016

$\frac{2016}{630}-\frac{9}{5}=\frac{2016-9*126}{630}=\frac{882}{630}=\frac{7}{5}$