Question

Tính 

( 1 + 2 + 3 + 4 + 5 + ...... + 2018 ) x ( 126126 x 127127 - 127127 x 126 )

Answer 1

( 1 + 2 + 3 + 4 + 5 + ... + 2018 ) x ( 126 x 127127 - 127127 x 126 )

= ( 1 + 2 + 3 + 4 + 5 + ... + 2018 ) x [( 126 - 126 ) x 127127 ]

= ( 1 + 2 + 3 + 4 + 5 + ... + 2018 ) x ( 0 x 127127 )

= ( 1 + 2 + 3 + 4 + 5 + ... + 2018 ) x 0

= 0

Tk nhé !

#tksnhieu

Answer 2

( 1 + 2 + 3 + 4 + 5 + ... + 2018 ) x ( 126 x 127127 - 127127 x 126 )

= ( 1 + 2 + 3 + 4 + 5 + ... + 2018 ) x [( 126 - 126 ) x 127127 ]

= ( 1 + 2 + 3 + 4 + 5 + ... + 2018 ) x ( 0 x 127127 )

= ( 1 + 2 + 3 + 4 + 5 + ... + 2018 ) x 0

= 0