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6. 0,75 : 0,3

= 3/4 : 3/10

= 3/4 × 10/3

= 5/2

= 2 1/2

= 2,5


7. 1,44 × 2 : 0,12

= 1 11/25 × 2 : 3/25

= 36/25 × 2 × 25/3

= 72/25 × 25/3

= 72/3

= 24


9. 3/4 + 25% × 1,5

= 3/4 + 25/100 × 1 1/2

= 3/4 + 1/4 × 5/2

= 3/4 + 5/8

= 6/8 + 5/8

= 11/8

= 1 3/8


9. 12 3/4 - ( 4 1/3 : 3/4)

= 12 3/4 - ( 13/3 : 3/4 )

= 12 3/4 - ( 13/3 × 4/3 )

= 12 3/4 - 52/9

= 16 1/36


10. ( 4/5 : 3/10 ) × ( 1 1/2 + 3/4 )

= ( 4/5 × 10/3 ) × ( 1 2/4 + 3/4 )

= 8/3 × 1 5/4

= 8/3 × 9/4

= 6