Bài 1. Tìm ma trận nghịch đảo của các ma trận sau A=


−1 −1 2
3 2 −5
−2 −1 −1

 ; B=


1 −1 0 0
−1 1 −1 0
0 −1 1 −1
0 0 −1 1


; C=


1 −1 −1 −1
−1 1 −1 −1
−1 −1 1 −1
−1 −1 −1 1



Will give the box plots below show the math scores of students in two different classes: class a 55 72 75 89 95 class b 55 70 75 94 100 based on the box plots, which statement is correct? a: the median score of class a is greater than the median score of class b. b: the lower quartile of class a is greater than the lower quartile of class b. c: the upper quartile of class a is greater than the upper quartile of class b. d: the maximum score of class a is greater than the maximum score of class b.