\(51\cdot49=\left(50+1\right)\cdot\left(50-1\right)=50^2-1=2500-1=2499\)
Đúng 1
Bình luận (0)
\(51\cdot49=\left(50+1\right)\cdot\left(50-1\right)=50^2-1=2500-1=2499\)
