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= 21/5 * 2/3 = (skracam 21 z 3)
= 7/5 * 2/1=
= 14/5 =
= 2 i 4/5
2 i 4/5 + 7 i 2/3 = (sprowadzam ułamki do wspólnego mianownika -> 15)
= 2 i 12/15 + 7 i 10/15=
= 9 i 22/15=
= 10 i 7/15
10 i 7/15 - 2 i 4/30 = (sprowadzam ułamki do wspólnego mianownika -> 15)
= 10 i 7/15 - 2 i 2/15=
= 8 i 5/15 =
= 8 i 1/3
8 i 1/3 * 1 i 7/20=
= 25/3 * 27/20 = (skracam ułamki)
= 5/1 * 9/4=
= 45/4=
= 11 i 1/4
11 i 1/4 + 9 i 3/4 =
= 20 i 4/4=
= 21
21 : 14/17=
= 21 * 17/14 = ( skracam 21 z 14)
= 3 * 17/2=
= 51/2=
= 25 i 1/2
21 i 1/2 - 4 i 2/3 = (sprowadzam ułamki do wspólnego mianownika -> 6)
= 21 i 3/6 - 4 i 4/6= (zamieniam 1 całość z 21 na 6/6)
= 20 i 9/6 - 4 i 4/6=
= 16 i 5/6