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0,9 : 1I2 + 1I3- 3I5 =
= 0,45 + 1I3 - 3I5 = (sprowadzamy do wspólnego mianownika)
= 27I60 + 20I60 - 36I60 =
= 47I60 - 36I60 =
= 11I60
9/10 ×2/1 + 1/3 -3/5 = 9/5 + 1/3 -3/5 = 27/15 + 5/15 - 3/5 = 32/15 - 3/5 = 32/15 - 9/15 = 23/15 = 1 8/15