Lösungen/Solutions/
B1S2Ue/Ex11

L = Lektion/ Leçon   -- Sprechstunde / heures de consultation
W = Work / Arbeit / Travail
A  =Anhang/  Annexe / Appendice

vecLen[a_] := Sqrt[a . a];
look[a_] := {a, " or ",  N[a]}

Ueb/Ex 1      W

Solve[{x + y + z == 1, y + z == 1, z == 1}, {x, y, 
        z}]

Ueb/Ex 2      W

Solve[{x + y + z == 1, x - y + z == 1, 
        x - y - z == 1}, {x, y, z}]

Ueb/Ex 3      W

Solve[{x + y + z == 1, x - y + z == 1}, {x, y}]

Ueb/Ex 4      W

Solve[{x + y == 1, y + z == 1, x - z == 1, 
        x + y + z == 2}, {x, y, z}]

Ueb/Ex 5      W

Solve[{x + y + z + w == 1, x + z + w == 1, 
        x + y - z + w == 1}, {x, y, z}]