Question

1+2+3...+100=?

99x3=

5+5x0=

câu hỏi cho Nguyễn Thị Thanh Hiền

Answer 1

1 + 2 + 3 + .... + 100 = 5050

99 x 3 = 297

5 + 5 x 0 = 0

Answer 2

1+2+3...+100 = ( 1 + 100 ) x 100 : 2

                      = 5050.

99 x 3 = 297.

5 + 5 x 0 = 5 + 0

               = 5

Answer 3

1+2+3+....+100=5050

99x3=297

5+5x0=0

Answer 4

1 + 2 + 3 ............ + 100 

= [ 100 + 1 ] x 100 : 2

= 101 x 100 : 2

= 10100 : 2

= 5050

  99 x 3

= [ 100 - 1 ] x 3

= 100 x 3 - 1 x 3

= 300 - 3

= 297

   5 + 5 x 0

=5 + 0

= 5

Answer 5

1+2+3+....+100=5050

99 x 3= 297

5+5x0= 5