rozwiąż 2. jesli x -1,5y1 3/4 12x - 4y + x. = 1/2x + 1/3y - 5=

12 * (-1,5) - 4 * (1 3/4) + (-1,5) = 12* (-3/2) - 4* (7/4) + (-3/2) =  -36/2 - 28/4 + (-3/2) = -72/4 - 28/4 + (-6/4) =  -106/4 = -26,5  1/2* (-3/2) + 1/3 * (7/4) - 5 =  -3/4 + 7/12 - 5 = -9/12 + 7/12 - 60/12 =  -62/12 = -31/6