Question

Ajutor..daca puteti la toate 3.Ms

Answer 1

b descompui in 1-1/2+1/2-1/3+1/3-1/4+.....=2012/2013 deci p intreaga 0
d 1+1+1+2+2+2+2+2+3+3+3+3+3+3+3+4+4+4+4+4+4+4+4+4+5+......+9+10
=3*1+5*2+7*3+9*4+11*5+13*6+15*7+17*8+19*9+10
=3+10+21+36+55+78+105+136+171+10
=625
e [3+7+2rad21]=[10+rad84]=10+9=19