2.1/2-0,57-65% pake cara

2 1/2 - 0,57 - 65%
= 5/2 - 57/100 - 65/100
= 250/100 - 57/100 - 65/100
= 128/100 => pec.biasa
= 1 28/100
= 1 7/25 => pec.campuran
= 1,28 => desimal

semoga membantu... :)