x²y-y+xy²-x= xy(x+y)-(x+y)= (x+y)*(xy-1)
(4+0,25)*(4*0,25-1)= 4,25*(1-1)= 0
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x²y-y+xy²-x= xy(x+y)-(x+y)= (x+y)*(xy-1)
(4+0,25)*(4*0,25-1)= 4,25*(1-1)= 0