Question

Oblicz:
a) 2 1/4 - 3 1/2 - 1 7/8 =
b) 1 2/5 - 3 3/4 - 2 3/10 =
c) 3 3/5 - (1 7/10 - 6 2/15) =
d) (-1 3/10 - 2 4/5) : (1 3/4 - 3 5/6) =
e) (-1 3/10 - 2 4/5) : (1 3/4 - 3 5/6) =

Są to ułamki, czyli np. 5 3/4 to 5

Answer 1

A)
2 1/4 - 3 1/2 - 1 7/8 = 9/4 - 7/2 - 15/8 = 18/8 - 28/8 - 15/8 = -10/8 - 15/8 = - 25/8 =      - 3 1/8

b)
1 2/5 - 3 3/4 - 2 3/10 = 7/5 - 15/4 - 23/10 = 28/20 - 75/20 - 46/20 = -47/20 - 46/20 = 
-93/20 = - 4 13/20

c)
 3 3/5 - (1 7/10 - 6 2/15) = 18/5 - (17/10 - 92/15) = 18/5 - (102/60 - 368/60) = 18/5 - 266/60 = 18/5 - 133/30 = 108/30 - 133/30 = -25/30 = - 5/6

d)
 (-1 3/10 - 2 4/5) : (1 3/4 - 3 5/6) = (-13/10 - 14/5) : (7/4 - 23/6) = (- 13/10 - 28/10) :   (21/12 - 46/12) = -41/10 : (- 25/12) = -41/10 * (- 12/25) = 246/125 = 1 121/125

e)
 (-1 3/10 - 2 4/5) : (1 3/4 - 3 5/6) =(-13/10 - 14/5) : (7/4 - 23/6) = (- 13/10 - 28/10) :   (21/12 - 46/12) = -41/10 : (- 25/12) = -41/10 * (- 12/25) = 246/125 = 1 121/125