Question

SKRÓĆ UŁAMKI WEDŁUG WZORU:

6/12= 6:2/12:2 = 3/6 = 3:3/6:3 = 1/2

a) 15/45=

b) 12/16=

2.dodaj ułamki.Jesli to mozliwe,skroc ułamek będący wynikiem dodawania

a 5/12 + 3/12 = [ ]/12 = [ ]:4/12:4 =

b 5/10 + 3/10=

c 6/15 + 4/15

3.srowadz ułamki do wspólnego mianownika i dodaj.

a 2/7 + 3/14 = 2*2/7*2 + 3/14 = [ ]/14 + --- (kreska ułamkowa) =

b 4/20 + 3/10 =

Answer 1

Zad 1

a) 15/45= (15:15)/(45:15)=1/3

b) 12/16= (12:4)/(16:4) = 3/4

 

Zad 2

a) 5/12 + 3/12 = [ 8 ]/12 = ( 8:4)/(12:4) =2/3

b) 5/10 + 3/10 = 8/10 = (8:2)/(10:2) = 4/5

c) 6/15 + 4/15 = 10/15 = (10:5)/(15:5) = 2/3

 

Zad 3

a 2/7 + 3/14 = (2*2)/(7*2) + 3/14 = 4/14 + 3/14 = 7/14 = 1/2

b 4/20 + 3/10 = 4/20 + (2*3)/(2*10) = 4/20+6/20 = 10/20 = 1/2

Answer 2

zad 1

a) 15/45 = 15:15/45:15 = 1/3

b) 12/16 = 12:4 / 16:4 = 3/4

 

zad 2

a) 5/12 + 3/12 = 8/12 = 8:4 / 12:4 = 2/3

b) 5/10 + 3/10 = 8/10 = 8:2 / 10:2 = 4/5

c) 6/15 + 4/15 = 10/15 = 10:5 / 15:5 = 2/3

 

zad 3

a) 2/7 + 3/14 = 2*2 / 2*7 + 3/14 = 4/14 + 3/14 = 7/14 = 1/2

b) 4/20 + 3/10 = 4/20 + 3*2 / 10*2 = 4/20 + 6/20 = 10/20 = 10:10 / 20:10 = 1/2