x * y = 2xy - 2x - 2y + 3
~~~~~~~~~~~~~~~~~
Arătați că x * y = 2 · (x - 1) · (y - 1) + 1
~~~~~~~~~~~~~~~~~
x * y = 2xy - 2x - 2y + 3
x * y = 2x · (y - 1) - 2 · (y - 1) + 1
x * y = (2x - 2) · (y - 1) + 1
x * y = 2 · (x - 1) · (y - 1) + 1
@robertinnifd
