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0,625 = 625 /1000 = 25 / 40 = 5 / 8
0,0208(3) = ( 2083 - 208 ) 90000 = 1875 / 90000 =75 / 3600 = 1 / 48
7 /12 + 4 /25 + 5 /8 + 1 /48 = 4 /25 + ( 7 /12 + 5 /8 + 1 /48) =
= 4 /25 +( 28 + 30 + 1) /48 = 4 /25 + 59 / 48 = ( 4 · 48 + 59 ·25) / 25 ·48=
= 1667 / 1200 = 1,3891(6)
b. 42 / 90 + 5 / 100 + 3 /180 + 11 / 90 + 5 / 60 =
= ( 42 + 11)/ 90 + ( 1 / 60 + 5 /60) + 5 /100=
= 53 / 90 + 6 /60 + 5 /100
= 53 / 90 + 1 /10 + 1 /20 =
= ( 53 · 2 + 18 + 9) /180 = 133 / 180 = 0,73(8)