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(4 i 1/2 * 5 i 1/3) : 5=
= (9/2 * 16/3) * 1/5=
= (9/1 * 8/3) * 1/5=
= 72/3 * 1/5 =
= 72/15=
= 4 i 12/15=
= 4 i 4/5
zad 2.
(15 i 1/6 + 10 i 13/16) - ( 15 i 1/6 - 10 i 13/16)=
= ( 15 i 8/48 + 10 i 39/48) - (15 i 8/48 - 10 i 39/48)=
= 25 i 47/48 - ( 14 i 56/48 - 10 i 39/48)=
= 25 i 47/48 - 4 i 17/48=
= 21 i 30/48 =
= 21 i 5/8