Question

Sprowadź do najprostrzej postaci w ułamkach zwykłych.

1)2 ¼ + 3 ⅔ - 3/5 = ?
2)1/18 - 5/6 + 7/24 = ?
3) (5 4/5 - 3 5/6) - ( 3 5/12 - 2 3/4 ) = ?

np. 3/5 - to ułamek trzy piąte.

Answer 1

1)2 ¼ + 3 ⅔ - 3/5 = 9/4+11/3-3/5=135/60+220/60-36/60=319/60=
=5 19/60
2)1/18 - 5/6 + 7/24 = 4/72 - 60/72 +28/72= - 28/72= - 7/18
3) (5 4/5 - 3 5/6) - ( 3 5/12 - 2 3/4 ) = (174/30 - 115/30) - (180/12 - 72/12)= 59/30 - 108/12=118/60 - 540/60= - 422/60= - 211/30=
= - 7 1/30

Answer 2

1)2 1/4 + 3 2/3 - 3/5 =
= 9/4 + 11/3 - 3/5 =
= 135/60 + 220/60 - 36/60 =
= 319/60 =
=5 19/60

2) 1/18 - 5/6 + 7/24 =
= 4/72 - 60/72 - 21/72 =
= 25/72 - 60/72 =
= -35/72

3) (5 4/5 - 3 5/6) - ( 3 5/12 - 2 3/4 ) =
= (29/5 - 23/6) - ( 41/12 - 11/4 ) =
= 174/30 - 115/30) - ( 41/12 - 33/12) =
= 59/30 - 8/12 =
= 51/30 =
= 1,7