oblicz ułamki 5/8-(0,8*3/8-4/5)= -2i1/2:1i2/3-3,75= [1,75+(-1i1/4)]=

5/8 - (0,8 * 3/8 - 4/5) = 5/8 - (8/10 * 3/8 - 4/5) = 5/8 - (1/10 * 3/1 - 4/5) =  = 5/8 - ( 3/10 - 4/5) = 5/8 - (3/10 - 8/10) = 5/8 - (-5/10) = 25/40 + 20/40 =  = 45/40 = 1 5/40 = 1 1/8  2 1/2 : 1 2/3 - 3,75 = -5/2 : 5/3 - 3 3/4 = -5/2 * 3/5 - 3 3/4 = -1/2 * 3/1 - 3 3/4 =  = -3/2 - 3 3/4 = -1 1/2 - 3 3/4 = -1 2/4 - 3 3/4 = -4 5/4 = -5 1/4 [1,75 + (-1 1/4)] = [1 3/4 - 1 1/4] = 2/4 = 1/2   (0,75 = 75/100 = 3/4) 

a) 5/8 - (3/10 -4/5)= 5/8 - (3/10 - 8/10)= 5/8 - (-5/10)=5/8+4/8=9/8=1 1/8 b) -5/2: 5/3 - 3  3/4= -5/2 · 3/5 - 3 3/4 = -1 1/2 - 3 3/4 = -1 2/4 - 3 3/4=  -4 5/4= - 5 1/4 c) 1,75 - 1,25 = 0,5