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13/8 - (0,9 - 3/4)=1,375-(0,9-0,75)=1,375-0,15=1,15
2.
3 + [1 - (7/5 - 0,9)]=3 + [1 - (1,4 - 0,9)]=3+[1-0,5]=3,5
3.
2,4 * 1/3 + 4,8 : 2 2/5=2,4*0,33+4,8:2,4=0,792+2=2,792
4.
3_3 : [2,25 - (1/2)2]=27:[2,25-¼]=27:2=13,5
5.
4,8 : 6/7 + 1,5 * (1/3)2=4,8:0,86+1,5*0,11=5,58+0,165=5,745