Question

Tìm x biết :

(2x+1)+(2x+2)+(2x+3)+...+(2x+2015)=0

 

 

Answer 1

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

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

=> 2015.2x + 2031120 = 0

=> 4030x = -2031120

=> x = -504

Answer 2

em mới hc lp 5 thui ạ! cho em xin lỗi nha!

Answer 3

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

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

=> 2015.2x + 2031120 = 0

=> 4030x = -2031120