(x+x+x+...+x)(50 số x)+(1+3+...+99)=0
(x+x+x+...+x)+2500=0
50.x+2500=0
50.x=0-2500=-2500
x=-2500:50
x=-50
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(x+x+x+...+x)(50 số x)+(1+3+...+99)=0
(x+x+x+...+x)+2500=0
50.x+2500=0
50.x=0-2500=-2500
x=-2500:50
x=-50
(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