Câu hỏi của vu phuong linh

Question

B= ( 1+6+11+...+2016) * (225-15 mũ 2

Nguyễn Phạm Hồng Anh · Accepted Answer

$B=\left(1+6+11+...+2016\right).\left(225-15^2\right)$

$\Rightarrow$ $B=\left(1+6+11+...+2016\right).\left(225-225\right)$

$\Rightarrow$ $B=\left(1+6+11+...+2016\right).0$

$\Rightarrow$ $B=0$

Câu trả lời:

$B=\left(1+6+11+...+2016\right).\left(225-15^2\right)$

$\Rightarrow$ $B=\left(1+6+11+...+2016\right).\left(225-225\right)$

$\Rightarrow$ $B=\left(1+6+11+...+2016\right).0$

$\Rightarrow$ $B=0$