Question

A=1+2+3+4+............+1000000

Answer 1

A=1+2+3+4+............+1000000

=\(\frac{1000000.\left(1000000+1\right)}{2}\)

=\(\frac{1000001000000}{2}\)

=500000500000

Answer 2

Có số số hạng là :

( 1000000 - 1 ) :  1 + 1 = 1000000

Tổng trên là :

( 1000000 +1 ) x 1000000 : 2 = 500000500000

Answer 3

A=(1000000+1).1000000:2=500000500000

Answer 4

Tổng là: \(\frac{\left(1000000+1\right)\cdot1000000}{2}\)=500000500000

Answer 5

1000001x500000=5000000500000