`( 0,55 xx 30 xx 2 + 11 xx 5 + 8 xx 2,75 )/(0,24 xx 470 + 0,8 xx 23 + 3 xx 3 xx 8 )`

`= (1,1 xx 30 + 11 xx 5+11xx 2 )/(3×8×4,7+8×2,3+9×8)

 `= ( 11 xx 3 + 11 xx 5 + 11 xx 2 )/( 14,1 xx 8 + 8 xx 2,3 + 9 xx 8 )`

`= ( 11 xx ( 3 + 5 + 2 ))/(8 xx (14,1 + 2,3 + 9 ))`

`= ( 11 xx 10 )/(8 xx 25,4)`

`= 110/203,2 = 275/508`

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