行列式计算 x y x+y y x+y x x+y x y

=X*(X+Y)*Y+Y*X*(X+Y)+Y*X*(X+Y)-(X+Y)*(X+Y)*(X+Y)-X*X*X-Y*Y*Y=3XY(X+Y)-(X+Y)^3-X^3-Y^3=相信下面的你就晓得做了.A1 A2 A3B1 B2 B3C1 C2 C3=A1B2C3+A2B3C1+B1C2A3-A3B2C1-A2B1C3-A1B3C2