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.

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

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