Huỳnh Anh Phương
11/09/2018 at 13:46-
Huy Toàn 8A (TL) 15/09/2018 at 06:19Let x, y be the length and width of the rectangle:
We have :
\(\left\{{}\begin{matrix}xy=8\\x=2y\end{matrix}\right.=>\left\{{}\begin{matrix}2y^2=8\\x=2y\end{matrix}\right.< =>\left\{{}\begin{matrix}y=2\left(cm\right)\\x=4\left(cm\right)\end{matrix}\right.\)
So the rectangle width is 2cm
Huỳnh Anh Phương selected this answer. -
Dương Đào Xuân 03/10/2018 at 14:00OÁCH SOẠCH