\(2n^2+7⋮n+3\)\\(\Rightarrow2n\left(n+3\right)-6n+7⋮n+3\)
\(\Rightarrow2n.\left(n+3\right)-\left(6n-7\right)⋮n+3\)
\(\Rightarrow6.n-7⋮n+3\)
\(\Rightarrow6\left(n+3\right)-18-7⋮n+3\)
\(\Rightarrow6\left(n+3\right)-25⋮n+3\)
\(\Rightarrow25⋮n+3\)
bạn kẻ bảng nốt nha
ai ko hiểu thì nhắn tin qua cho mk nha