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6/10 + 1/2 : ( 2/3 - 25/100 ) × 9/5
6/10 + ( 1/2 : ( 200/300 - 75/300 ) × 9/5 )
6/10 + ( 1/2 : 125/300 × 9/5 )
6/10 + ( 1/2 × 300/125 × 9/5 )
6/10 + 2.700/1.250
3/5 + 54/25
15/25 + 54/ 25
= 69/25
= 2,76