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x+y 1
ketika x 0 , y 1
ketika y 0 , x 1
0,1 dan 1,0
x dan y 1
kalau digambar trus diarsir sudut2 arsirannya itu 0,0 0,1 dab 1,0
x 0 y 0 z 0
x 0 y 1 z 3 <<< maksimum
x 1 y0 z 1
B. 3