Question

1+2+3+4+...+145
Cu suma lui Gaus

Answer 1

1+2+3+...+145=145x(145+1)/2=145x146/2=145x73=10585

Answer 2

Răspuns

1 + 2 + 3 + 4 + ...... + 145 = 10 585

=  145 × ( 1 + 145 ) : 2 =

= 145 × 146 : 2 =

= 145 × 73 =

= 10 585