Question

1+1+2+2+3+3+4+4+...+50+50=?

 

Answer 1

1+1+2+2+3+3+4+4+...+50+50

= ( 1+2+3+4+...+50 ) x 2

= 1275 x 2 

= 2250

Answer 2

1+1+2+2+3+3+4+4+...+50+50

=2x1 + 2x2 + 2x3 + 2x4 + ...+ 2x50

=2x(1+2+3+4+...+50) 

=2x 1275=2550

Answer 3

bằng 2550

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Answer 5

1 + 1 + 2 + 2 + 3 + 3 + 4 + 4 + ... + 50 + 50

= ( 1 + 2 + 3 + 4 +... + 50 ) x 2

= 1275 x 2

= 2250