Question

tinh nhanh [1+3+3+5+7+....+1009] x [4053:7-579]

Answer 1

=[(1009-1):2+1] x (1009+1):2 x [579-579]

=505 x 505 x 0

=505 x 0

=0

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Answer 2

[1+3+3+5+7+....+1009] x [579-579]

[1+3+3+5+7+...+1009] x 0=0

Answer 3

( 1 + 3 + 3 + 5 + 7 + ... + 1009)  x ( 4053 : 7 - 579 )

= ( 1 + 3 + 3 + 5 + 7 + ... + 1009 ) x ( 579 - 579 )

= ( 1 + 3 + 3 + 5 + 7 + ... + 1009 ) x 0

= 0 

Answer 4

[1+3+3+5+7+...+1009] × [4053:7-579]

= [1+3+3+5+7+...+1009]×[579-579]

= [1+3+3+5+7+.....+1009] × 0

= 0

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