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1 4/5-0,25+3/4=
9/5-25/100+3/4=
9/5-1/4+3/4=
36/20-5/20+15/20=
46/20=23/10=2 3/10
2.
2,75+(1 1/2-25%)=
275/100+(3/2-25/100)=
11/4+(3/2-1/4)=
11/4+(6/4-1/4)=
11/4+5/4=
16/4=4