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(2+x)+(4+x)+(6+x) .....+(52+x)
(2+x)+(4+x)+(6+x)+...+(52+x)=780 . x=...?
(2+x)+(4+x)+(6+x)+...+(52+x)=780
(2+x)+(4+x)+(6+x)+...........+(52+x)=780
( 2+x ) + (4+x ) + ( 6+x) + ....+ ( 52+x) = 780
[ 2 + x ] + [ 4 + x ] + [ 6 + x ] + ... [ 52 + x ] = 780
( 2+x) + (4+x ) + ( 6+x ) + ......+ ( 52+x ) = 780
(x+2)+(x+4)+(x+6).....(x+52)=764
tìm x sao cho:(x+2)+(x+4)+(x+6)+...(x+52)=780
( x + 2 ) + ( x + 4 ) + ( x + 6 ) + ( x + 8 ) + ... + ( x + 50 ) + ( x + 52 ) =1092