A. Tính giá trị định thức của ma trận 2A, cho biết: = (
1 2 0
3 1 1
1 2 1
)

4should be the last one n=4

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .