(4,5-1 3/4)×(75%÷1 1/2)

( 4,5 - 1 3/4 ) x ( 75% : 1 1/2 )
= ( 45/10 - 7/4 ) x ( 75/100 : 3/2 )
= (90/20 - 35/20) x (75/100 x 2/3)
= 55/20 x 150/300
= 8.250/6.000
= 1 2.250/6.000
= 1 9/24 => masing2 dibagi 250
= 1 3/8 => pec.campuran
= 1,375 => desimal