Question

Zad. 1

a) 1/4 - 1/8 + 5/6

b) 4/9 - 1/6 + 5/12

c)2/7 + 1/2 - 10/28

d) 2 2/3 - 1 9/12 + 3 10/15

e) 5 1/2 - 2 2/3 + 3 3/8

f) 17/4 - 2 1/10 + 42/40

Zad.2

a) 7/8 : 4/5

b) 5/12 : 1/9

c) 2 1/2 : 3/7

d) 4 3/8 : 1 3/32

Zad.3

a) 6 1/2 * 4/13 - 8/15 : 2

b) 7 1/4 : 1 11/14 -1 2/5 * 15/28

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Answer 1

zad.1

a) 1/4 - 1/8 + 5/6 = 12/48 - 6/48 + 40/48 = 6/48 + 40/48 = 46/48

b) 4/9 - 1/6 + 5/12 = 16/36 - 6/36 + 15/36 = 10/36 + 15/36 = 25/36

c) 2/7 + 1/2 - 10/28 = 8/28 + 14/28 - 10/28 = 22/28 - 10/28 = 12/28

d) 2 2/3 - 1 9/12 + 2 10/15 = 2 40/60 - 1 45/60 + 2 40/60 = 1 100/60 - 1 45/60 + 2 40/60 = 55/60 + 2 40/60 = 2 95/60 = 3 35/60

e) 5 1/2 - 2 2/3 + 3 3/8 = 5 12/24 - 2 16/24 + 3 9/24 = 4 36/24 - 2 16/24 + 3 9/24 = 2 20/24 + 3 9/24 = 5 29/24 = 6 5/24

f) 17/4 - 2 1/10 + 42/40 = 4 1/4 - 2 1/10 + 1 2/40 = 4 10/40 - 2 4/40 + 1 2/40 = 2 6/40 + 1 2/40 = 3 8/40

 

 

zad.2

a) 7/8 : 4/5 = 7/8 * 5/4 = 35/32 = 1 3/32

b) 5/12 : 1/9 = 5/12 * 9/1 = 45/12 = 3 9/12

c) 2 1/2 : 3/7 = 5/2 * 7/3 = 35/6 = 5 5/6

d) 4 3/8 : 1 3/32 = 35/8 * 32/35 = 4

 

 

zad.3

b) 7 1/4 : 1 11/14 -1 2/5 * 15/28 = 28/4 * 14/25 - 7/5 * 28/15 = 392/100

 - 196/75 = 1176/300 - 784/300 = 392/300 = 1 92/300