Question

oblicz pamiętając o kolejności wykonywania działań

a) 9 7/12-7 4/15+2 3/4-1 11/20

b) 20-(17 3/20+1 13/15)

c) 30 5/12 -(13 1/8-10 5/6)

oblicz

a) 6 7/25-1 4/20) -(8 1/16-7 24/48)

b) 4 2/15+5 13/20)-(2 19/24-1 1/5)

prosze o szybką pomoc

dziękuje

Answer 1

a)

9 7/12 - 7 4/15 + 2 3/4 - 1 11/20 = 9 i 35/60 - 7 i 16/60 + 2 i 45/60 - 1 i 33/60 =

2 i 19/60 + 2 i 45/60 - 1 i 33/60 = 4 i 64/60 - 1 i 33/60 = 3 i 31/60

 

b)

20-(17 3/20+1 13/15) = 20 - (17 i 9/60 + 1 i 52/60) = 20 - 18 i 61/60 =

20 - 19 i 1/60 = 59/60

 

c)

30 5/12 -(13 1/8-10 5/6) =30 i 5/12 - (13 i 3/24 - 10 i 20/24) =

30 i 5/12 - (12 i 27/24 - 10 i 20/24) = 30 i 5/12 - 2 i 7/24 = 30 i 10/24 - 2 i 7/24 =

28 i 3/24 = 28 i 1/8

 

oblicz 

a) (6 7/25-1 4/20) -(8 1/16-7 24/48) =

(6 i 28/100 - 1 i 20/100) - (8 i 1/16 - 7 i 1/2) =

5 i 8/100 - (7 i 17/16 - 7 i 8/16) = 5 i 2/25 - 9/16 =

5 i 32/400 - 225/400 = 4 i 432/400 - 225/400 = 4 i 207/400

 

b)

(4 2/15+5 13/20)-(2 19/24-1 1/5) =

(4 i 8/60 + 5 i 39/60) - (2 i 95/120 - 1 i 24/120) =

9 i 47/60 - 1 i 71/120 = 9 i 94/120 - 1 i 71/120 = 8 i 23/120