Respuestas

2013-04-15T03:06:32+02:00

1/4 -1/5 = 1/20

 

3/4 -1/3 = 5/12

 

1/20 + 5/12 = 7/15

 

2/7 - 1/5 = 3/35

 

7/15 : 3/35 = 49/9

  • Usuario de Brainly
2013-04-15T04:54:14+02:00

1/4  - 1/5 = ...buscamos comun denominador

5/20 - 4/20 = 1/20

 

 1/3 -  3/4 =

4/12 - 9/12 = - 5/12

 

1/20 + ( - 5/12) =

1/20 - 5/12 =

3/60 - 25/60 = - 22/60 = - 11/30

 

- 11/30 : ( 2/7 - 1/5 ) =

- 11/30 : (10/35 - 7/35)=

- 11/30 : 3/35 =

- 77/18

 

espero que te sirva, salu2!!!