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2 3/4 -(2,25 + 2 1/2 - 40%)= ...40%= 40/100 = 0,4
2,75 -(2,25 + 2,5 - 0,4) =
2,75 -(4,35)= - 1.60
Tinggal ganti
6,75- 4,35 =2,40
27/4-((225+250-40)/100)
27/4-435/100
(675-435)/100=240100=24/10=2 4/10= 2 2/5