pilne na rano      / jako linia ułamkowa      (3/4-1/5):1/2   3,2:(0,8-2/5   2/3  x (1/2-1/8)   4,8+1/3 x (0,2-0,6)

(3/4-1/5):1/2 = (15/20 - 4/20) * 2 = 11/20 * 2 = 11/10 = 1,1   3,2:(0,8-2/5 = 3,2 : ( 0,8 - 0,40 = 3,2 : 0,4 = 8   2/3  x (1/2-1/8) = 2/3 * (4/8 - 1/8) = 2/3 * 3/8 = 2/8 = 1/4   4,8+1/3 x (0,2-0,6) = 4,8 + 1/3 * (-0,4) = 4,8 + 1/3 * - (4/10) = 4,8 - 4/30 = 48/10 - 2/15 = 24/5 - 2/15 = 72/15 - 2/15 = 70/15 = 4 10/15 = 4 2/3

(3/4 - 1/5) : 1/2= (15/20-4/20) : 1/2= 11/20 * 2/1 = 22/20 = 1 i 2/20= 1 i 1/10   3,2:(0,8 - 2/5) = 3,2 :( 0,8 -0,4) = 3,2: 0,4= 8   2/3 * (1/2-1/8)= 2/3 *( 4/8 -1/8) = 2/3 * 3/8 = 6/24 = 1/4   4,8+ 1/3*(0,2-0,6) = 4,8+1/3*(-0,4)= 4,8+1/3*(-4/10)= 4i8/10-4/30= = 4 i 24/30 - 4/30 = 4 i 20/30 = 4 i 2/3