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2.d
3.c
Odp: A
2. 4x-2xy-1-(-5x+xy+1) = 4x-2xy-1+5x-xy-1 = 9x - 3xy - 2
Odp: D
3. (2x+y)-(x-2y) = 2x + y - x + 2y = 3y + x
Odp: D