Question

Tính bằng cách nhanh nhất

  910 + 920 + 930 + 940 + 950 + 960 + 970 + 980 +990 + 1000

Answer 1

\(910+920+930+940+950+960+970+980+990+1000\)

\(=\left(910+990\right)+\left(920+980\right)+\left(930+970\right)+\left(940+960\right)+\left(950+1000\right)\)

\(=1900+1900+1900+1900+1950\)

\(=7600+1950\)

\(=9550\)

Answer 2

`#3107.101107`

\(910 + 920 + 930 + 940 + 950 + 960 + 970 + 980 +990 + 1000\)

`= (910 + 1000) + (920 + 990) + (930 + 980) + (940 + 970) + (950 + 960)`

`= 1910 + 1910 + 1910 + 1910 + 1910`

`= 1910 \times 5`

`= 9550`

Answer 3

=9550 nha