<=> ( x + x + x + ... + x + x ) + ( 1 + 3 + 5 + .... + 97 + 99 ) = 0
<=> x.50 + { [ ( 99 + 1 ) . 50 ] : 2 } = 0
<=> 50x + ( 500 : 2 ) = 0
<=> 50x + 250 = 0
<=> 50x = - 250
<=> x = - 250 : 50
=> x = - 5
(x+1) + (x+3) + (x+5)+ .... + (x+99) =0
a, ( x+1)+ (x+3)+(x+5) +...+(x+99)= 0
b, (x-3) + ( x-2)+ ( x-1)+ ...+ 10+11 =0
[x+1]+[x+3]+[x+5]+..................+[x+99]=0
(x+1)+(x+3)+(x+5)+....+(x+99)=0
(x+1)+(x+3)+(x+5)+.....+(x+99)=0
(x-1)+(x-3)+(x-5)+...+(x-99)=0
(x+1)+(x+3)+(x+5)+.........+(x+99)=0
(x +1) + (x +3) +(x + 5) +...+(x + 99) = 0
1, Tìm x biết :
a,( x +1 ) + (x+3) +( x+ 5) + ...... +( x + 99) -0
b, (x -3 )+ ( x -2 ) +( x- 1) +........+ 10+11 =0
