Question

  Tính bằng cách hợp lí:

[1+3+5+7+...+2011+2013]x[125125x127-127127x125]

Answer 1

[ 1 + 3 + 5 + 7 + ... + 2011 + 2013 ] x [ 125125 x 127 - 127127 x 125 ]

= [ ( 2013 + 1 ) x 1007 : 2 ] x [ ( 125 x 1001 )  x 127 - ( 127 x 1001 ) x 125 ]

= 1008007 x [ 125 x 1001 x 127 - 127 x 1001 x 125 ]

= 1008007 x [ ( 125 - 125 ) x ( 127 - 127 ) x ( 1001 - 1001 ) ]

= 1008007 x [ 0 x 0 x 0 ]

= 1008007 x 0

= 0

Answer 2

= minh chiu ban tu lam

Answer 3

Ta có : ( 1+3+5+7+...+2011+2013 ) x ( 125125x127-127127x125 )

=         ( 1+3+5+7+...+2011+2013 ) x ( 125x1001x127-127x1001x125 )

=         ( 1+3+5+7+...+2011+2013 ) x 0

=         0

Tk và kb vs mk nak ^_^

Answer 4

= [1 + 3 + 5 +...+ 2011 + 2013] x 0 = 0

tk nha