2 + x + 4 + x + ....... + 52 + x = 780
(x + x + ..... x) + (2 + 4 + 6 + ...... + 52) = 780
26 * x + (52 + 2) x 26 : 2 = 780
26 * x + 702 = 780
26 * x = 780 - 720
26 * x = 78
x = 78 : 26
x= 3
(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
tìm x sao cho:(x+2)+(x+4)+(x+6)+...(x+52)=780
(2+x)+(4+x)+(6+x)+...+(52+x)=780
x=
Tìm x để : ( 2 + x ) + ( 4 + x ) + ( 6 + x ) + ... + ( 52 + x ) = 780
