Question

Tìm số tự nhiên x biết:

(x+1)0+(x+2)+(x+3)+...+(x+26)=377

Answer 1

(x + 1) + (x + 2) + (x + 3) + ... + (x + 26) = 377

=> x + 1 + x + 2 + x + 3 + ... + x + 26 = 377

=> (x + x + x+ ... + x) + (1 + 2 + 3 + ... + 26) = 377

=> 26x + \(\frac{\left(26+1\right).26}{2}\)=377

=> 26x + 351 = 377

=> 26x = 377 - 351

=> 26x = 26

=> x = 1

Answer 2

<  = > 26x + 26.27:2 = 377

26x + 351 = 377

26x = 377 - 351 = 26

x = 26 : 26 = 1