Question

[thanlinhtinh]

1+2+3+4+...+x=168 tim x

ai lam xong dau tien to kich cho nha

Answer 1

[l҉o҉n҉g҉ d҉z҉]

Vì 1 + 2 + 3 + 4 + ,,,,,, + x = 168

=> \(\frac{x\left(x+1\right)}{2}=168\)

\(\Rightarrow x\left(x+1\right)=336\)

sai đề nhé 

Answer 2

[võ lê thế bảo]

cong toi may zay ban