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45-40=5 cmiiw
48 - 3 - 3 =36/48
33 - × = 36/48
42 = 36/48
1584 - 48× = 1512
1584 - 1512 = 48×
72 = 48×
× = 72/48
= 1.5 cm
jadi , lebar karton tersebut adalah = 1.5 cm