jika x=-1 dan y=2 maka nilai (x-1+y-1)(xy-1-x-1y):(x+y)-1(x-2-y-2)

x = -1
y = 2

=> (x -1+y-1)(xy-1-x-1y) : (x+y) - 1(x-2-y-2)
=> (-1 -1 + 2-1)((-1)2-1-(-1)-1.2) : ((-1)+2) - 1(-1-2-2-2)
=> (-1)(-4) : 1 - 1(-7)
=> 4 : 1 + 7
=> 4 : 8
=> 1 : 2
=> 0,5

semoga membantu