Question

Tìm x biết (2x+1) + (2x+2) +.....+ (2x + 2015) = 0.Trả lời x = 

Answer 1

﴾2x + 1﴿ + ﴾2x + 2﴿ + ... + ﴾2x + 2015﴿ = 0

=> 2x + 1 + 2x + 2 + ... + 2x + 2015 = 0

=> 2015 . 2x + ﴾1 + 2 + ... + 2015﴿ = 0

=> 4030x + ﴾2015 + 1﴿.2015 : 2 = 0

=> 4030x + 2031120 = 0

=> 4030x = ‐2031120

=> x = ‐504

Answer 2

(2x+1) + (2x+2) +.....+ (2x + 2015) = 0

(2x+2x+...+)+(1+2+...+2015)=0

2015*2x+2031120=0

4030x=-2031120

x=-504